At the drop of a hat

Example:

My friend had an extra Taylor Swift ticket and offered it to me. She's my favorite, so I took the ticket at the drop of a hat. I didn't even hesitate for a second.

Meaning: To do something suddenly or immediately, especially because you're excited about it.

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To have an axe to grind

Example:

I have an axe to grind with my friend. I lent him $100, and he said he'd pay me back the next day, but it's already been over two weeks. The next time I see him, I'm not going to be in a good mood when we talk.

Meaning: This expression means that someone in the past treated you poorly, and you have a problem with what the did, and you are angry at them.

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