jill /d͡ʒɪl/noun 4verb 1forms 4phrases 3 noun4 •A female ferret. •A jillstrap: the female counterpart to a jockstrap. •A pelvic protector, a woman’s equivalent of a man’s jock.GOALIE JOCK OR JILL CUP AND STRAP PRICE RANGE: $10.00 - $25.00 This is a specialized piece of equipment with extra padding to protect the groin area. — 2004 •A young woman; a sweetheart; like the variant spelling Gill it was also associated with various assertive uses of the term flirt, as in flurt-gills (used by William Shakespeare for a 'woman of light or loose behavior'). verb1 •(slang, vulgar) To masturbate.Sue was fingering herself in my bed. IN MY BED. I couldn't believe it. I tried to pretend that I was still asleep but she caught me peeking as she was jilling herself. — 1997 formsjilled · jilling · jills · Jills Phrases with jill every woman JillAll the female members of a group with no exceptions. jill of all tradesA woman competent in many endeavors rather than only one. jill offTo masturbate.