knick ‧ ers /ˈnɪkəz $ -ərz/ BrE AmE noun [plural]
[ Date: 1800-1900 ; Origin: knickerbockers ]
1 . British English a piece of women’s underwear worn between the waist and the top of the legs SYN panties :
a pair of frilly knickers
2 . American English ↑ knickerbockers
3 . (don’t) get your knickers in a twist British English spoken used to say that someone is upset, or to tell someone not to get upset