Verb

• S: (v) close up, clam up, dummy up, shut up, belt up, button up, be quiet, keep mum (refuse to talk or stop talking; fall silent) "The children shut up when their father approached"
• S: (v) lock in, lock away, lock, put away, shut up, shut away, lock up (place in a place where something cannot be removed or someone cannot escape) "The parents locked her daughter up for the weekend"; "She locked her jewels in the safe"
• S: (v) hush, quieten, silence, still, shut up, hush up (cause to be quiet or not talk) "Please silence the children in the church!"

Adjective

• S: (adj) pent, shut up (closely confined)