Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps


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

Derived forms: clamming up, clammed up, clams up

Nearest

claimer
claiming race
claims adjuster
claims adjustor
clairaudience
clairvoyance
clairvoyant
clam
clam chowder
clam dip
clam up
clamant
Clamato
Clamatores
clamatorial
clambake
clamber
clammily
clamminess
clammy
clammy chickweed