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The Collaborative International Dictionary of English v.0.48:

Strum \Strum\, v. t. & i. [imp. & p. p. Strummed; p. pr. & vb. n. Strumming.] [Probably of imitative origin. Cf. Thrum.] 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. [1913 Webster]