Idiom medium 34 / 51
“play it by ear”
i · The common misuse One wrong form
ii · What it meansTwo lines, no filler
The idiom comes from music — a player without a score proceeds 'by ear,' listening for what fits. 'By year' is a mondegreen; it has no musical origin.
iii · Memory hookKeep this one
Musicians play by ear, not by year. The idiom is about improvising, not scheduling.