His girth steadily expanded as he approached fifty.
2 belt, girdle, border, cincture, waistband, cestus, cummerbund, Archaic zone, US and Canadian cinch:
Tighten that girth or the saddle will come off.
Advanced English Dictionary
+noun 1[U, C] the measurement around sth, especially a person's waist: a man of enormous girth + a tree one metre in girth / with a girth of one metre + He rested his hands on his broad girth (= his large stomach). 2[C] a leather or cloth strap that is fastened around the middle of a horse to keep the seat, (called a SADDLE), or a load in place
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