Knock it on the head

To stop doing something.

Look Love Albatross, we've been going for four hours now. I've come seven times. Can't we just knock it on the head?

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Knock it on the head

Used if a prior arrangement is terminated by either party usually due to laziness, a lack of interest or tiredness.
Turn it in

Joe - "You still wanna go to the club tonight?"
Pete - "Nah, knock it on the head mate, im too tired!"

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