Klein Dictionary, גמגם

גמגם to stammer, stutter.
    — Pilp. - גִּמְגֵּם 1 he stammered, stuttered; 2 he hesitated.
    — Pulp. - גֻּמְגַּם was stammered, was stuttered. [Aram. גַּמֽגֵּם, Arab. jamjama (= he stammered, stuttered); prob. of imitative origin.] Derivatives: גִּמְגּוּם, גַּמְגּֽמָן, מֽגַמְגֵּם, מְגֻמְגָּם.