like waving a red flag in front of a bull
idiomPart ofbull
like waving a red flag in front of a bull — idiom
1. Something that is certain to make someone very angry.
1.idiom
Definition
Something that is certain to make someone very angry.
Example
Mentioning his ex-wife to him is like waving a red flag in front of a bull.
Bringing up politics at dinner was like waving a red flag in front of a bull.