scend

verb (used without object) (of a vessel)

1. to heave in a swell.
2. to lurch forward from the motion of a heavy sea.

noun

3. the heaving motion of a vessel.
4. the forward impulse imparted by the motion of a sea against a vessel.

verb scends, scending, scended, sends, sending or sent

1. (of a vessel) to surge upwards in a heavy sea

noun

2. the upward heaving of a vessel pitching
3. the forward lift given a vessel by the sea