/ pɜːm; NAmE pɜːrm/ noun , verb
■ noun
a way of changing the style of your hair by using chemicals to create curls that last for several months :
to have a perm
■ verb
[ vn ] to give sb's hair a perm :
to have your hair permed
a shampoo for permed hair
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WORD ORIGIN
1920s: abbreviation of permanent .