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The short thick digit of the human hand, next to the index finger and opposable to each of the other four digits.
A marijuana cigarette; joint (1960s+ Narcotics)verb
(also thumb a ride) To solicit rides along a highway by pointing with one's thumb in the direction one wishes to travel; hitchhike (1939+)Related Terms
[narcotics sense fr the fact that one sucks the cigarette as a baby does its thumb]
short, thick first digit of the human hand and of the lower-primate hand and foot. It differs from other digits in having only two phalanges (tubular bones of the fingers and toes). The thumb also differs in having much freedom of movement and being opposable to tips of other digits. The corresponding first digit (most medial digit) in other vertebrates is also called the thumb, especially if it has some manipulative or special ability (e.g., in the raccoon and the bat)