cluck
[noun]
Synonyms: dunce, dimwit, dumb bunny, dumb cluck, featherweight, lackwit, nitwit, pinhead, simp, wantwit

[TahlilGaran] English Synonym Dictionary ▲

I. cluck¹ /klʌk/ verb
[Date: 1400-1500; Origin: From the sound]

1. [intransitive] if a chicken clucks, it makes a short low sound

2. [intransitive and transitive] to express sympathy or disapproval by saying something, or by making a short low noise with your tongue:
Edith clucked her tongue impatiently.
cluck over/around etc
She stood clucking over the baby.
—clucking adjective:
clucking noises

[TahlilGaran] Dictionary of Contemporary English ▲

II. cluck² noun [countable usually singular]

1. a low short noise made by chickens

2. a sound made with your tongue, used to show disapproval or sympathy:
a disapproving cluck

3. dumb/stupid cluck American English a stupid person

[TahlilGaran] Dictionary of Contemporary English ▲