To clean the oil from (wood) after combing.
The retreat of a wave that has broken on a beach. When a wave breaks, water rushes up the beach as swash and is then drawn back toward the sea as backwash.

ETYM Prob. from Icel. itha; cf. Icel. pref. ith- back, AS. ed-, OS. idug-, Old High Germ. ita-; Goth. id-.
A miniature whirlpool or whirlwind resulting when the current of a fluid doubles back on itself; SYN. twist.