n. (Mus.) A peculiar action of the tongue by flute players in articulating staccato notes; also, the rapid repetition of notes in cornet playing. [ 1913 Webster ]
n. Deceit; duplicity. [ 1913 Webster ]
Now cometh the sin of double-tongue, such as speak fair before folk and wickedly behind. Chaucer. [ 1913 Webster ]
a. Making contrary declarations on the same subject; deceitful.
Likewise must the deacons be grave, not double-tongued. 1 Tim. iii. 8. [ 1913 Webster ]