1. (n.) The short, thick first digit of the human hand, differing from the other fingers in having but two phalanges; the pollex. See Pollex.

2. (v. t.) To handle awkwardly.

3. (v. t.) To play with the thumbs, or with the thumbs and fingers; as, to thumb over a tune.

4. (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.

5. (v. i.) To play with the thumb or thumbs; to play clumsily; to thrum.

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