The meaning of ὑποτύπτω to plunge or dip into a liquid, is so different from that of τύπτω, as to suggest that the word does not really contain τύπτω but arises from ὑπο-δύπτω (δύπτω = dive, plunge), in the same way as ποταπός from ποδαπός (Schweizer, Gramm. der Pergamenischen Inschriften, p. 107, note 1), κωλακρἐται from κωλαγρέται, Πεταγείτνιος from Πεδαγείτνιος (Solmsen, Beitr. zur gr. Wortforschung, p. 234), δεκάταρχος from δεκάδαρχος (cf. Thackeray, Gramm. of Old Testament in Greek, p. 103), in all of which a voiced stop situated between two unvoiced stops becomes unvoiced.