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Verb: button up
  1. Refuse to talk or stop talking; fall silent
    "The children button up when their father approached"
    - close up, clam up, dummy up [N. Amer], shut up, belt up, be quiet, keep mum

Derived forms: buttoned up, buttons up, buttoning up

Nearest

buttock
buttocks
button
button fern
button hole
button mangrove
button pink
button quail
button snakeroot
button tree
button up
button-down
buttoned
buttoned-down
buttoned-up
buttonhole
buttonhole stitch
buttonhook
buttonlike
button-quail
button-shaped