A primitive root; properly, to snatch away, i.e. Terminate; but used only as denominative from caph (in the sense of a vestibule), to wait at the threshold -- be a doorkeeper.
see HEBREW caph
H5605. saphaph
[ספף verb denominative Hithpô`. stand at, or guard, the threshold; — Infinitive construct בְּבֵית הִסְתּוֺפֵף אֱלֹהַי בָּחַ֫רְתִּי Psalm 84:11 I choose standing at the threshold in the house of my God.