1N-VAR [oft poss NOUN](人、动物等的)围长、腰围 The girth of an object, for example a person's or an animal's body, is its width or thickness, considered as the measurement around its circumference. (人、动物等的)围长、腰围 [formal]
A girl he knew had upset him by commenting on his increasing girth.
2N-COUNT (马的)肚带,鞍带 A girth is a leather strap which is fastened firmly around the middle of a horse to keep the saddle or load in the right place. (马的)肚带,鞍带