Antonyms for off the top of head

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

"to be at the head or in the lead," c.1200, from head (n.). Meaning "to direct the head (toward)" is from c.1600. Related: headed, heading. The earliest use of the word as a verb meant "behead" (Old English heafdian). Verbal phrase head up "supervise, direct" is attested by 1930.

MORE RELATED WORDS FOR OFF THE TOP OF HEAD

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.