shut up

Ikhras - Arabic

Halt dein Mund
and
Kes sesini

bIjatlh 'e' yImev

klingon

French:

fermes-toi / fermes ta gueule (mostly French Canada)

ta gueule / la ferme / fermes-la (mostly France)

Fermes ta gueule fils de pute

"Cerrá el orto."

(Argento)

"Veuillez cesser ce charivari" in French

Armenian:

Լռի՛ր (Lrrir)

Ձայնդ կտրի՛ր (Dzaynd ktrir) which literally means - cut your voice

cala a boca (the right portuguese)

SMAUL! (Swabian)

Can I swear?

Завали

In Bosnian

Ušuti! From Šutnja - no one talking being quit
Umukni - one word for stop talking (comes from Muk means The Quiet)
Začepi (čep meaning cap)
Začepi gubicu - shut your mouth but insult for mouth (Comes from Gubavac - means leper, so you can draw the conclusion)

American Sign Language

View attached image.

閉嘴-Traditional Chinese

Shut Up

😜

Korean
닥쳐(däk chər)

STFU n00b

Dutch:
Hou je bek.
That last word can be substituted by a lot of words, a few:
smoel, waffel, kop, bakkes...

"Kes sesini" !
"Kapa çeneni" !
"Sus" or "Sus lan" !
All in Turkish

Khafe Sho - خفه شو

Persian xD

黙れ (Damare) - Japanese