jumper
n. countablen. a piece of clothing made of wool or cotton that you wear on the top half of your body to stay warm. It usually has long sleeves and no buttons.
n. a knitted garment intended to cover the torso and arms. Primarily used in British English to describe what North Americans refer to as a sweater.
I need to wear a thick jumper because it is cold outside.
She pulled a blue wool jumper over her head before heading out for a walk in the autumn air.
While the fashion industry often distinguishes between cardigans and pullovers, the term jumper remains the standard British designation for any heavy knitted top designed for warmth.
From jump + -er.
From the term jump (“short coat”) + -er, originally in sailors' jargon, ultimately of uncertain origin. Jump is possibly from Scottish English jupe (“man's loose jacket or tunic”), from Middle English juype, gype, joupe, from Old French jupe, juppe, from Arabic جُبَّة (jubba); see also jibba. Cognate with Middle Low German jōpe, gōpe (“waistcoat, jacket”), German Joppe (“jacket”). Alternatively, perhaps derived from jump.
Primarily British English; in American English, the word refers to a type of sleeveless dress worn over a blouse.