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.
© Webster 1913.