by-stroke

Etymology
From.

Noun

 * 1) An accidental or slyly given stroke; a side-blow or side-wind; a ruse.
 * 2) * 1907, Caroline Lane Reynolds Slemmer Jebb (lady.), Arthur Woollgar Verrall, Life and letters of Sir Richard Claverhouse Jebb, O. M., LITT. D.:
 * We must be content to signalize a by-stroke of sympathetic delicacy.
 * We must be content to signalize a by-stroke of sympathetic delicacy.