I. ˈkwāk intransitive verb
( quaked ; quak·ing )
Etymology: Middle English, from Old English cwacian
Date: before 12th century
1. : to shake or vibrate usually from shock or instability
2. : to tremble or shudder usually from cold or fear
II. noun
Date: 14th century
: an instance of shaking or trembling (as of the earth or moon) ; especially : earthquake