Knickers are underwear, especially women's underpants. Your little cousin's favorite knickers might be her blue and red Wonder Woman knickers.

Knickers, meaning underpants, is primarily a British term, although Americans will usually know what you mean if you use it. In the US, the primary, if outdated, meaning of knickers is "short pants." These old fashioned trousers, also known as knickerbockers or "breeches," were loose and knee-length, and worn by men and boys. Golfers and skiers commonly wore knickers in the early 20th century.

Definitions of knickers
  1. noun
    underpants worn by women
    synonyms: bloomers, drawers, pants
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    type of:
    an undergarment that covers the body from the waist no further than to the thighs; usually worn next to the skin
  2. noun
    trousers ending above the knee
    synonyms: breeches, knee breeches, knee pants, knickerbockers
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    informal term for breeches
    breeches made of buckskin
    plus fours
    men's baggy knickers hanging below the knees; formerly worn for sports (especially golf)
    trunk hose
    puffed breeches of the 16th and 17th centuries usually worn over hose
    type of:
    pant, trouser
    (usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately
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