- buckle (v.1)
[buckle 词源字典]
- late 14c., bokelen, "to fasten with a buckle," from buckle (n.). Related: Buckled; buckling. To buckle down "apply effort, settle down," (1874) is said to be a variant of knuckle down (see knuckle).[buckle etymology, buckle origin, 英语词源]