Klein Dictionary, גיס

גיס to mobilize.
    — Pi. - גִּיֵּס he mobilized, recruited, enlisted.
    — Pu. - גֻּיַּס was mobilized, was recruited, was enlisted.
    — Hith. - הִתְגַּיֵּס he volunteered, enlisted. [Denominated from גַּיִס. cp. Arab. jayyasha (= he levied troop), from jaysh (= army). Derivatives: גִּיּוּס, הִתְגַּיְּסוּת, מְגֻיָּס, מִתֽגַּיֵּס.