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Definition of thumb:

  1. The short, thick first digit of the human hand, differing from the other fingers in having but two phalanges; the pollex. See Pollex.
  2. To handle awkwardly.
  3. To play with the thumb or thumbs; to play clumsily; to thrum.
  4. To play with the thumbs, or with the thumbs and fingers; as, to thumb over a tune.
  5. 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.


ripple, finger, flip out, sky, ovolo, cockle, riffle, gimp, tack, throw, leaf, ruffle, alternate, hitch, preaxial digit, hobble, investigate, flicker, feel, turn over, flip-flop, scan, click, dip into, flick, first digit, pitch, hitchhike, flip over, flip through, words, switch, catch, snap, twitch, flip, interchange, undulate, run through, riff, jerk, quarter round, limp, buck, skim, toss, pollex.

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