1. [mid-19C+] a blow, a hit, a punch; also fig.
2. [late 19+] a drink of, a swig or swallow of, e.g. a belt of coffee.
3. [1930s+] (drugs) the immediate effect of a drug, usu. one that has been injected.
4. [1930s+] a thrill.
5. [1940s–60s] a measure of marijuana or any other drug.
6. [1940s–60s] an act of sexual intercourse.
7. [1950s] (Aus.) a prostitute.
8. [1950s] a sexually appealing woman.
[1970s+] (Irish) a reprimand from the Church, spec. from a bishop.
[1920s+] to be rejected, to be jilted.
[1930s+] (orig. Aus.) to get rid of, to throw out, to dismiss, to reject, to jilt.
SE in slang uses
[late 19C] underhand, illegal, cheating.
[1930s+] (orig. RAF) to be quiet; esp. in excl. belt up! shut up!
[late 19C–1910s] (Aus.) to be the outstanding example, the ‘champion’.
[1960s] (US gay) to be a promiscuous ‘feminine’ lesbian.
[late 19C] (US teen) to be exceptional, to ‘take the biscuit’ .
[late 19C–1920s] (US) to hand over money.
1. [late 18C; mid-19C+] in one’s stomach, swallowed.
2. [20C+] (also under one’s vest) personally achieved or experienced.