H1849. daphaq
[דָּפַק] verb beat, knock (Arabic pour out, also drive (beasts)) —
Qal Perf.3masculine plural suffix וּדְפָקוּם consecutive [Gen 33:13], but read 1singular suffix ᵑ6 ᵐ5 וּדְפַקְתִּים Sam Di beat (in driving, drive severely or cruelly); Participle דּוֺפֵק [Song 5:2] absolute knocking (at door).
Hithpa`el Participle עַלהַֿדָּ֑לֶת מִתְדַּמְּקִים [Judg 19:22] beat violently (beat themselves tired) against the door.