frog v. to unravel a knitted garment. Also frog stitch v., to intentionally rip out a seam, and n., an intentionally ripped seam. Etymological Note: While it is possible that, as frequently stated, frog does come from the admonishment of “rip it, rip it” that might be given when seams are imperfect, which is similar to an imitation of a croaking frog, it is also possible that an unraveled or undone garment has loops of thread or yarn resembling frogging, which is a looped ornamental braid, or coat fastenings made of cylindrical buttons that go into fabric loops. (source: Double-Tongued Dictionary)