The short, thick first digit of the human hand, differing from the other fingers in having but two phalanges; the pollex. See Pollex.
- The short thick digit of the human hand, next to the index finger and opposable to each of the other four digits.
- A corresponding digit in other animals, especially primates. Also called pollex.
- The part of a glove or mitten that covers the thumb.
- Architecture An ovolo.
- To scan (written matter) by turning over pages with or as if with the thumb.
- To disarrange, soil, or wear by careless or frequent handling.
- Informal To solicit (a ride) from a passing vehicle by signaling with the thumb.
- To scan written matter by turning over pages with or as if with the thumb: thumbed through the latest issue of the magazine.
- Informal To hitchhike.
- all thumbs Lacking physical coordination, skill, or grace; clumsy.
- thumb (one's) nose To express scorn or ridicule by or as if by placing the thumb on the nose and wiggling the fingers.
- thumbs down An expression of rejection, refusal, or disapproval.
- thumbs up An expression of approval, success, or hope.
- under (one's) thumb Under the control of someone; subordinate to.