- (v.t.) To play with the thumbs or with the thumbs and fingers; as, to thumb over a tune.
- (n.) The short, thick first digit of the human hand, differing from the other fingers in having but two phalanges; the pollex. See Pollex.
- (v.i.) To play with the thumb or thumbs; to play clumsily; to thrum.
- (v.t.) To soil or wear with the thumb or the fingers; to soil or wear out, by frequent handling; also, to cover with the thumb; as, to thumb the touch-hole of a cannon.
- (v.t.) To handle awkwardly.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). thumb. Retrieved September 22, 2026, from http://smartdefine.org/thumb/definitions/2072441 |
| Chicago | Webster's. 2011. "thumb" http://smartdefine.org/thumb/definitions/2072441 (accessed September 22, 2026). |
| Harvard | Webster's 2011, thumb, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/thumb/definitions/2072441>. |
| MLA | Webster's. "thumb" 28 May 2011. Web. 22 September 2026. <http://smartdefine.org/thumb/definitions/2072441> |