Godan verb with 'ru' ending, Transitive verb
to cut (cloth, paper, etc.); to cut off
あのグループとの関係は断ち切るべきだ。You should cut off your connections with that group. to sever (ties); to break off (relations); to give up (an attachment, habit, etc.); to stop (e.g. a vicious cycle)
to cut off (a supply route, enemy's retreat, etc.); to block; to break up (e.g. an intelligence network)
Also written 裁ち切る【たちきる】、截ち切る【たちきる】