Impressing someone
Doing something which was never done before
Showing something astonishing
This movie just knocked my socks off.
Lara’s performance at the concert last night just knocked my socks off.
This exciting news knocked the socks off of everyone in the school.
The color that John has chosen to wear for his birthday party really knocked my socks off.
With your new makeover, you will knock their socks off.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.