Longman Dictionary of Contemporary English homepage

Topic: HUMAN

Date: 1500-1600
Origin: Because it is directly below the eye

eye tooth

noun
     
eye tooth [countable]
1

somebody would give their eye teeth for something

spoken used to say that someone wants something very much:
I'd give my eye teeth to be able to play the piano like that.
2HBH one of the long pointed teeth at the corner of your mouth [= canine tooth]
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