hair-elastic
US /ˈher iˌlæs.tɪk/
UK /ˈher iˌlæs.tɪk/
1.
tóc đàn hồi
a small piece of elastic (= material that stretches), made into a ring shape and sometimes covered with cloth, used for holding hair, especially for holding long hair at the back or top of the head:
:
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She always keeps a hair elastic on her wrist in case she needs to tie her hair back.