use your brain(s)

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Winwin2011

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Aug 4, 2011
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Chinese
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Hong Kong
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I heard the following dialouge from a moive:

Boy's mum: What do we do with the eggs?
Boy's dad: Give them back.
Boy: Well, what do I say?
Boy's dad: Tell her we don't eat eggs. We're allergic to them or something. Come on, use your brains.

I suppose the boy has only one brain, why does his dad say "brains".

Thanks.
 

Grumpy

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Aug 12, 2009
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English
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It's one of the conventions in English that we refer to the actual organ in our head as our "brain", but we call our intelligence/reasoning ability/initiative our "brains". In this case, the father is telling the boy to use his reasoning ability, and hence his "brains".
 
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