Peak.
1. (Nautical.) a. The upper, after corner of a trysail, spanker, or sprit-sail. [1644] b. The upper end of a gaff. The national ensign is flown at the peak. c. To top a gaff or yard more obliquely. d. To raise the oars upright amidships. e. The pointed bill beyond an anchor's palm. 2. The leathern front of a cap.