SCEND

scend, surge

(verb) rise or heave upward under the influence of a natural force such as a wave; “the boats surged”

Source: WordNet® 3.1

Etymology

Noun

scend (plural scends)

The rising motion of water as a wave passes; a surge; the upward angular displacement of a vessel, opposed to pitch, the correlative downward movement.

Verb

scend (third-person singular simple present scends, present participle scending, simple past and past participle scended)

(intransitive) To heave upward.

Source: Wiktionary