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off and on
off duty
off guard
Off hand
off her guard
off his guard
off one's guard
Off one's hands
Off side
Off stump
off the beaten track
off the books
off the cuff
off the hook
Off the hooks
off the record
-- off the top of my head --
off the trolley
off year
off your guard
off-and-on
off-axis reflector
off-base
off-Broadway
off-by-one error
off-center
off-centered
off-color
off-colour
off-day
off-duty
off-guard
off-hand

off the top of my head

from quick recollection, or as an approximation; without research or calculation; - a phrase used when giving quick and approximate answers to questions, to indicate that a response is not necessarily accurate.

See also: Head

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