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shut up (v.)

c. 1400, "keep from view or use," from shut (v.) + up (adv.). Meaning "cause to stop talking" is from 1814; intransitive meaning "cease from speaking" is from 1840. Put up or shut up "defend yourself or be silent" is U.S. slang, by 1868.

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Definitions of shut up from WordNet
1
shut up (v.)
refuse to talk or stop talking; fall silent;
The children shut up when their father approached
Synonyms: close up / clam up / dummy up / belt up / button up / be quiet / keep mum
shut up (v.)
place in a place where something cannot be removed or someone cannot escape;
Synonyms: lock in / lock away / lock / put away / shut away / lock up
shut up (v.)
cause to be quiet or not talk;
Synonyms: hush / quieten / silence / still / hush up
2
shut up (adj.)
closely confined;
Synonyms: pent
From wordnet.princeton.edu

Dictionary entries near shut up

shul

shun

shunt

shush

shut

shut up

shutdown

shute

shut-eye

shut-in

shutout