Similar words: team up, dream up, calamus, thalamus, hypothalamus, clam, clams, clamp. Meaning: v. refuse to talk or stop talking; fall silent.
31. Whenever Bev walked by, Roy got so nervous he would just clam up.
32. The hit singles and No 1 album have, evidently, not made her clam up for fear of adverse publicity.
More similar words: team up, dream up, calamus, thalamus, hypothalamus, clam, clams, clamp, clammy, clamour, clamor, clamber, clamp down, clampdown, clamoring, clamouring, clamorous, reclamation, exclamation, exclamatory, declamatory, acclamation, preeclampsia, proclamation, pre-eclampsia, sum up, warm-up, warm up, drum up, firm up.