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English definition of “off the top of your head”

off the top of your head

informal
If you say a fact off the top of your head, you say it immediately, from memory: "What date is their wedding?" "I couldn't tell you off the top of my head."Doing things without fear or proper thoughtHurrying and doing things quicklyBusy and active
(Definition of off the top of your head from the Cambridge Learners Dictionary © Cambridge University Press)
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