Pronunciation: ˌ tw ē -d ə l- ' d ə m- ə n(d)- ˌ tw ē -d ə l- ' d ē
Function: noun
Etymology: English tweedle to chirp + dum (imit. of a low musical note) & dee (imit. of a high musical note)
Date: 1725
: two individuals or groups that are practically indistinguishable