flare

flare — verb

1. If a flame or fire flares, it suddenly becomes brighter and burns with an unstea

1.verbintransitiveB1
Definition

If a flame or fire flares, it suddenly becomes brighter and burns with an unsteady light, often for just a few moments before fading or going out.

Example

The campfire flared up when Indra added dry leaves to it.

phrasal pattern: flare up (of fire)

A match flared briefly in the dark room before going out.

Common collocations
  • flare up
  • fire flares
  • flame flares
  • match flares
  • candle flares
Synonyms
  • blaze

    suggests a stronger, more sustained flame than flare

  • flash

    quicker and brighter, usually a single burst of light

  • flicker

    implies a weak, wavering flame, not a sudden bright burst

Antonyms
  • dwindle

    to gradually become smaller or less bright

  • die down

    to slowly lose strength and fade away

Grammar Patterns

flare

flare up

Usage Note

Often used with 'up' to emphasise the suddenness of the burst of flame. 'Flare up' can also describe a fire that has been dampened or nearly out and reignites briefly.

Common Mistakes

The fire flared for hours without stopping.
The fire flared for a few seconds before dying down.
'flare' describes a brief or unsteady burning, not a steady, long-lasting flame.

2. When something unpleasant — such as fighting, a medical condition, or a strong e

2.verbintransitiveB2
Definition

When something unpleasant — such as fighting, a medical condition, or a strong emotion — flares or flares up, it starts again suddenly or becomes much more serious after a period of being quiet or controlled.

Example

The violence between the two communities flared up again after the court decision.

phrasal pattern: flare up (of conflict)

Yuki's back pain flares every time she sits at the computer for too long.

intransitive: pain flares

Common collocations
  • violence flares (up)
  • pain flares (up)
  • anger flares
  • tensions flare
  • conflict flares (up)
  • temper flares
  • disease flares up
Synonyms
  • erupt

    more dramatic and sudden; often used for violence or emotion

  • intensify

    focuses on increasing strength rather than sudden onset

  • reignite

    specifically about something returning after a pause

Antonyms

Grammar Patterns

flare up

flare

Usage Note

The form 'flare up' is more common than 'flare' alone for this sense. Subjects are usually negative: violence, conflict, tension, anger, pain, disease, or an old problem. Not used for positive situations — a party does not 'flare up'.

Common Mistakes

The celebration flared up when the music started.
The celebration got more exciting when the music started.
'flare up' is only used for negative or unpleasant situations.
My excitement flared when I saw the gift.
My excitement grew when I saw the gift.
'flare' implies sudden worsening, not joyful increase.

3. to become gradually broader towards the bottom or at one end — for example, when

3.verbtransitive / intransitiveB1
Definition

to become gradually broader towards the bottom or at one end — for example, when a person's nostrils spread wider in anger, or the lower part of a skirt is cut to be wider than the top.

Example

The horse's nostrils flared when it caught the scent of water.

intransitive: body part flares

Élise bought a skirt that flares out just below the knee.

intransitive: clothing flares

Common collocations
  • nostrils flare
  • skirt flares
  • trousers flare
  • flare out
  • flare at the bottom
Synonyms
  • widen

    more general, not specific to one end of something

  • spread

    emphasises outward movement in all directions

  • expand

    suggests increase in overall size, not just at the end

Antonyms
  • narrow

    to become less wide

  • tighten

    to become narrower or more closed

Grammar Patterns

nostrils flare

trousers / skirt flares

flare one's nostrils

Usage Note

When used transitively, the object is almost always 'nostrils'. The intransitive use is more common and describes either a body part (nostrils) or an item of clothing (skirt, trousers) that widens towards the bottom.

Common Mistakes

She flared her eyes in surprise.
She flared her nostrils in surprise.
'flare' is used for nostrils, not for eyes.
Phrasal verbs

flare up

phrasal verb

To suddenly become worse or more intense, especially after a period of calm.

My back injury flared up after I lifted the heavy box.

The argument between the two neighbors flared up again last night.

flare — noun

Word family

  • flared
    adjectiveB2
  • flaring
    adjectiveB2
  • flare-up
    nounB2

Synonym discussion

Sense: noun/2

All four words refer to something that communicates a warning, but they differ in medium and purpose. A 'flare' is a brightly burning device, typically pyrotechnic, used for distress signals — it is the only one that produces actual fire or light as its primary means of communication. 'Beacon' usually refers to a fixed, steady light source used for navigation or guidance (e.g., a lighthouse beacon, a radio beacon), rather than an emergency call for help. 'Signal' is far broader — it can be a gesture, a sound, a flag, or an electronic transmission; a flare is one type of signal, but not all signals are flares. 'Alarm' focuses on the warning itself (often a sound or electronic alert) and carries a sense of urgency or danger; you set off an alarm, but you fire a flare. In short: a flare says 'I need rescue right now' with a bright visual; a beacon says 'this is here to guide you'; a signal is any transmitted message; an alarm says 'something is wrong' and is often audible.

Common collocations

Adverbs

Phrases

Prepositions

Etymology

GermanicDutchOld NorseEnglish

Flare first appeared in English in the mid-1500s meaning 'to spread out' or 'display', likely coming from Middle Dutch 'vleren' (to spread) or from Old Norse 'flara' (to flicker, flutter). By the 1600s it had developed the sense of 'sudden bright burning', as a fire that spreads outwards in a gust of wind. From this came the modern uses: a signal light (1800s, from the bright burn), a sudden worsening (from the idea of fire re-igniting), and the widening shape in clothing (from the original meaning of spreading outward). The gymnastics and sports terms are 20th-century extensions of the 'widening' or 'sudden burst' ideas.