cub

From Latin cubāre (to lie down, recline) and the related stem -cumbere (to lie). Despite the accidental resemblance to the island name Cuba, the productive English root is about lying or resting upon something: incubate (to lie on eggs), incubator (a place to nurture), and incubus (a demon that lies upon sleepers). The same family includes recumbent (lying back) and succumb (to lie down under a force).