Reconstruction:Proto-West Germanic/skip

Etymology
From.

Noun

 * 1)  ship
 * 2)  any hollow or concave manmade object
 * 3)  vessel, tub

Reconstruction notes
The more general sense of hollowed-out objects is possibly inherited from pre-Germanic and a relic from before the meaning narrowed to “ship”, as this is a common semantic shift among many languages and would furthermore fit the etymology (whether it is 🇨🇬 or 🇨🇬).