Use you loaf
To use common sense. This phrase is used to tell someone, in a slightly angry tone, to think more about what they are doing.
“You should use your loaf and cram for the exam, otherwise you will fail”, said the angry father to his son.
ORIGIN
Soldiers hidden in the trenches would use a stick and a loaf of bread to find out if the snipers are around when they when they wanted to come out.
WORDS
loaf: one bread.
to cram for: to learn hard and quickly before an exam.
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