What is Knock It On The Head?
1.
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?
2.
Used if a prior arrangement is terminated by either party usually due to laziness, a lack of interest or tiredness.
 
Joe - "You still wanna go to the club tonight?"
Pete - "Nah, knock it on the head mate, im too tired!"
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