TIDDLER Meaning of TIDDLER in English n. Brit. colloq. 1. a small fish, esp. a stickleback or minnow. 2 an unusually small thing or person. Etymology: perh. rel. to TIDDLY(2) and tittlebat, a childish form of stickleback Oxford English vocab. Оксфордский английский словарь. 2012