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Buckle \Buc"kle\, v. t. [imp. & p. p. {Buckled}; p. pr. & vb. n. {Buckling}.] [OE. boclen, F. boucler. See {Buckle}, n.] 1. To fasten or confine with a buckle or buckles; as, to buckle a harness. 2. To bend; to cause to kink, or to become distorted. 3. To prepare for action; to apply with vigor and earnestness; -- generally used reflexively