Buc·kle v. t. [imp. & p. p. Buckled p. pr. & vb. n. Buckling.]
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; -- 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.
Cartwright buckled himself to the employment. --Fuller.
4. To join in marriage. [Scot.]