Noah Webster's Dictionary (v. t. & i.) 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.

Multi-Version Concordance Strum (1 Occurrence) Amos 6:5 who strum on the strings of a harp; who invent for themselves instruments of music, like David; (WEB KJV JPS ASV BBE DBY WBS YLT RSV NIV)