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1. An earring that clips onto the earlobe, as opposed to being inserted through a piercing. Jen never got her ears pierced, so we're going to need to find her some nice clip ons for her wedding day.
2. A necktie that clips onto the collar, as opposed to being tied. When I was a kid, I used to wear a clip on before I knew how to tie a tie.
clip something on(to) someone or somethingand clip something on
to attach something to someone or something with a clip. I clipped a little name tag onto him before I put him on the plane. I clipped on a name tag.