Headlong (to cast to fall) - Vine's Expository Dictionary of New Testament Words
Headlong (to cast to fall)[ 1,,G2630, katakremnizo ]
signifies to throw over a precipice" (kata, "down," kremnos, "a steep bank," etc.), said of the purpose of the people of Nazareth to destroy Christ, Luke 4:29.
[ 2,,G4248, prenes ]
an adjective denoting "headlong, prone," is used with the verb ginomai, "to become," in Acts 1:18, of the death of Judas, "falling headlong;" various suggestions have been made as to the actual details; some ascribe to the word the meaning "swelling up."