n. & v.
n. 1 an incorrect idea or opinion; a thing incorrectly done or thought. 2 an error of judgement.
v.tr. (past mistook; past part. mistaken) 1 misunderstand the meaning or intention of (a person, a statement, etc.). 2 (foll. by for) wrongly take or identify (mistook me for you). 3 choose wrongly (mistake one's vocation). and (or make) no mistake colloq. undoubtedly. by mistake accidentally; in error. there is no mistaking one is sure to recognize (a person or thing). mistakable adj. mistakably adv.
[ ME f. ON mistaka (as MIS-(1), TAKE) ]