To tell someone to use their brain more in analysing what they are doing.
To use common sense.
This phrase is used in an angry tone.
It is an old fashioned UK way of talking to tell someone to be more mindful.
‘Loaf’ here is equivalent to ‘head’.
I do not like it that you talk about people’s disabilities so often. You ought to use your loaf and understand that you may be hurting someone’s sentiments.
Is it so hard to use your loaf and understand how much pain she is going through currently?
“I do not mind going through it again but when writing the exam you will need to use your loaf and get it right”, said the angry mother to her daughter.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.