be on a short fuse
be on a short fuseor
have a short fuse
If someone is on a short fuse or has a short fuse, they lose their temper very easily. He warned Abbott that he was on a short fuse. He is irritable and has a short fuse, letting you know when he's not pleased. Note: See the explanation at light the fuse.
be on/have a short ˈfuse(informal) be likely to get angry easily, because you are tired, stressed, etc: Your father’s having trouble at work, so his temper’s on a short fuse today. ♢ Be careful what you say to the director. She has a very short fuse.
A fuse is a piece of string or paper which is lit to make a bomb explode.