Browse phrases beginning with: [A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U,V][W][X,Y,Z] Belt upMeaning 'Be quiet'. Also, since the introduction of car seat belts - an injunction to fasten one's belt. Origin UK slang. This is first cited by Eric Partridge in his 1949 A Dictionary of Slang:
The seat belt usage came in the UK in 1983, when the Ministry of Transport introduced legislation to enforce the wearing of car seat belts. This is from a newspaper headline, 1st January 1983:
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