What is the pied wagtail; -- so called in allusion to its beating the water with its tail while tripping along the leaves of water plants. [Prov. Eng.] called?

washerwoman — (Zoöl.) The pied wagtail; -- so called in allusion to its beating the water with its tail while tripping along the leaves of water plants. [Prov. Eng.]. (Webster's 1913.)