Origin: Germanic Old English prefix
Beanie has 2 different meanings across 1 category:
A cap that fits the head closely, usually knitted from wool.
"She pulled her warm beanie down over her ears to keep out the winter chill."
In plain English: A beanie is a soft, close-fitting hat that covers your head and ears without any brim.
"He pulled his beanie down over his ears to keep warm in the cold wind."
Usage: Use "beanie" in casual speech or writing; avoid it in formal contexts where "knit cap" or "woolen hat" is preferred. Do not confuse this noun with the verb form of "bean," which means to strike someone on the head.
The word beanie comes from combining bean, which means "head," with the diminutive suffix -ie. It originally referred to a soft cap that covers just the top of one's head.