If someone is hot under the collar, they are angry. If you get hot under the collar, you feel annoyed, indignant or embarrassed.
Sample Usage
The arguments seemed unfair to me and I got pretty hot under the collar when I thought about them later. If anyone criticizes his proposals, Minister immediately gets hot under the collar. The politician was really hot under the collar when you told him you lost the seat. I get hot under the collar every time I think about the incident.
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