means A child or young person — or, as a verb, to tease or joke with someone.

from The noun comes from Old Norse 'kið,' meaning a young goat, brought over by Norse speakers and settling into English by the medieval period. For centuries it meant only the goat; the slang sense of 'human child' is a later, informal leap — playful enough that respectable writers once flinched at it. The verb 'to kid,' meaning to fool or tease, is younger still and probably grows from this child sense: to 'kid' someone is, roughly, to treat them like a credulous youngster.