stroke

different strokes for different folks: seedifferent.

not (or never) do a stroke of work do no work at all.

put someone off their stroke disconcert someone so that they do not work or perform as well as they might; break the pattern or rhythm of someone's work.

stroke of genius an outstandingly brilliant and original idea.

stroke of luck (or good luck) a fortunate occurrence that could not have been predicted or expected.

stroke someone (or someone's hair) the wrong way irritate a person.