Knock your socks off

Today's idiom was uttered during fights, I'm thinking when an especially powerful hit provided the needed knockout in a fight. But it became a popular phrase in the mid-1960s when Pepsi-Cola wanted to increase the popularity of a southern drink called Mountain Dew. It was a regional drink that Pepsi thought had potential to become popular nationwide. The first ad campaign promised to "knock the socks off" anyone who drank it. (source)

The phrase today is a positive one meaning that someone who has their socks knocked off has been surprised or astonished.

Comments

Butter someone up

There are two probable origins for this idiom and I think both are equally plausible. The first one is that when you spread butter on bread you are buttering it up like one would do when trying to flatter someone. The second is in ancient India there was a practice of throwing balls of butter at statues to ask for favor, i.e. buttering them up. ( source ) When we use the phrase today we generally mean that extreme flattery is used to gain information or favor. It's not always necessarily a compliment.

More bang for your buck

This phrase was used a lot in 1953 but an earlier citation puts it at 1940 in a Metals and Plastics Publications advertisement. Read about it here . The phrase means you get more for your money.

Call it a Day

The literal use of this phrase hails from 1838 when the phrase originally was "call it half a day" to mean leaving work early. (source) The modern use of the phrase is to indicate ending something due to false sense of accomplishment.

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