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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] 2. To bend; to cause to kink, or to become distorted. [1913 Webster] 3. To prepare for action; to apply with vigor and earnestness; -- formerly, generally used reflexively, but by mid 20th century, usually used with down; -- as, the programmers buckled down and worked late hours to finish the project in time for the promised delivery date. [1913 Webster +PJC] Cartwright buckled himself to the employment. --Fuller. [1913 Webster] 4. To join in marriage. [Scot.] --Sir W. Scott. [1913 Webster]