ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: wag (I) + tail
1. : any of numerous chiefly Old World birds (family Motacillidae) related to the pipits and having a trim slender body and a very long tail that they habitually jerk up and down — see pied wagtail , yellow wagtail
2. : a bird resembling a wagtail (as an American water thrush or an Australian fantail) ; especially : willie wagtail