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Definition of quack: 1. A boastful pretender to medical skill; an empiric; an ignorant practitioner.
2. Hence, one who boastfully pretends to skill or knowledge of any kind not possessed; a charlatan.
3. Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.
4. The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise.
5. To act the part of a quack, or pretender.
6. To make vain and loud pretensions; to boast.
7. To utter a sound like the cry of a duck.

Synonyms:

fraud, pretender, faker, dishonest, unqualified, phony, impostor, dissembling, fake, pretentious, mountebank, true, false, charlatan, humbug

ululation

bay, call, gobble, bleat, cackle, squawk, cluck, mew, cuckoo, chatter, snort, bawl, chirp, bark, twit, coo, neigh, bellow, crow, roar, squeal, cry, trill, hoot, whinny, moo, caw, purr, snarl, warble, howl, ululate, yelp, grunt, bray, meow, honk, growl