Dictionary entry

κρούω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

κρούω,

[in LXX: seq. ἐπί, Jg 19:22, Ca 5:2 (דִפק);] c, acc., τ. αὐλαίαν, Jth 14:14*;]

to strike, knock: at a door (κόπτειν, in Att.), Mt 7:7, 8, Lk 11:9, 10 12:36, Ac 12:16, Re 3:20; c. acc., τ. θύραν, Lk 13:25, Ac 12:13.†