Klein Dictionary, חפף ᴵᴵ

חפף ᴵᴵ to rub, cleanse the head by rubbing.
    — Qal - חָפַף PBH 1 he rubbed; NH 2 he cleansed the head by rubbing, shampooing.
    — Niph. - נֶחְפַּף was rubbed, was cleansed (said of the head), shampooed.
    — Pi. - חִפֵּף he rubbed.
    — Nith. - הִתֽחוֹפֵף he rubbed himself. [Aram. ףַפַף, Syr. חָף, חַף (= he rubbed), Arab. ḥaffa (= he dipilated), ḥāffa (= edge).] Derivatives: חַף, חָפוּף, חִפּוּף, חֲפִיפָה ᴵᴵ, חַפָּן.