be no joke
idiomPart ofjoke
be no joke — idiom
1. used to say that a situation is serious, difficult, or unpleasant and should not
1.idiom
Definition
used to say that a situation is serious, difficult, or unpleasant and should not be treated lightly.
Example
Climbing that mountain with a heavy backpack is no joke, even for experienced hikers.
Getting the house ready for the inspection was no joke and took the whole weekend.