Button Up
[v] refuse to talk or stop talking; fall silent; "The children shut up when their father approached"
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bang, bar, barricade, batten, batten down, bolt, button, cap, carry to completion, choke, choke off, clam up, clap, clean up, climax, close, close out, close up, complete, conclude, constrict, contain, contract, cover, crown, culminate, dummy up, end, fas