Cookie-jar meaning

A jar for storing cookies.
noun
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A vessel for storing cookies or other food.

I'll just put these cookies in the cookie jar and I'll be right out.

noun
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(Internet) The storage space for browser cookies.
noun
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(with) a (or one's) hand in the cookie jar
  • (in) the act of stealing something.
idiom
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Idioms and Phrasal Verbs

(with) a (<i>or</i> one's) hand in the cookie jar