Keep your nose to the grindstone

While there are two different potential origins for this phrase one seems more plausible than the other. It seems that holding someone's nose to the grindstone was originally a form of punishment. And it wasn't literal, it was a figure of speech to indicate someone had been strapped to a workbench so that they had to work continuously. (source)

Today we use it in a figurative way to say someone is working hard and without breaks.

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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.

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.

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