håll käften

Etymology
Imperative of. Literally "Hold your jaw!"

Interjection

 * 1)  shut up

Usage notes
Closer in tone to "Shut the fuck up!" than "Shut up!" The shortened form often sounds milder.

Synonyms (milder)

 * (chiefly jocular)
 * (chiefly jocular)
 * (chiefly jocular)
 * (dated, impolite)
 * (chiefly jocular)
 * (chiefly jocular)
 * (dated, impolite)