
Catch somebody on the hop
Readiness
The phrase emphasizes someone's lack of preparation for a situation or event.

When the pop quiz was given, it really caught me on the hop.
Surprise Element
Implies an element of surprise that can cause confusion or disadvantage.

The sudden inspection caught the staff on the hop.
British Origin
This phrase is primarily used in the UK, so knowing your audience helps avoid miscommunication.

As an American, I was caught on the hop by their British slang.
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