Strum v. t. & i. [imp. & p. p. Strummed p. pr. & vb. n. Strumming.]  To play on an instrument of music, or as on an instrument, in an unskillful or noisy way; to thrum; as, to strum a piano.
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  strum
       n : sound of strumming; "the strum of a guitar"
       v : sound the strings of (a string instrument); "strum a guitar"
           [syn: thrum]
       [also: strumming, strummed]