Entry 1 sense Webster, 1913 Overfly /ōvˌ-ẽrf-lī'/ · O·ver·fly · IPA /ˌoʊvərflˈaɪ/ 01 v. t. To cross or pass over by flight. imp. Overflew; p. p. Overflown; p. pr. & vb. n. Overflying 1. To cross or pass over by flight.