jail-bait

Noun

jailbait (usually uncountable, plural jailbaits)

1. (slang, usually) A sexually mature person below, or appearing to be below, the legal age of consent, who is regarded, usually by an adult, as being sexually attractive and/or seductive.
   • "The first time she modelled for Edward Weston, in March 1934, Charis Wilson knew she didn’t look good. At 20 she was “a piece of jailbait”, a mere child, especially with the stumpy plaits into which she sometimes twisted her hair."2009, The Economist, Charis Wilson, model and writer, died on November 20th, aged 95