# off the top of one's head

> English word · Prep_phrase

## Definitions
1. In an extemporaneous manner; without careful thought, preparation, or investigation.
2. Used other than figuratively or idiomatically: see off, top, head.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/off-the-top-of-one-s-head