Godan verb with 'mu' ending, Intransitive verb
to cut deep into
その場しのぎの対策では麻薬中毒問題に切り込むことはできないでしょう。Stopgap measures won't make a dent in drug addiction. to cut one's way into (an enemy position); to rush on; to raid; to attack
to press someone hard (e.g. with questions); to get to the heart of (a matter)
Also written 斬り込む【きりこむ】