pull-through (Noun) — Cleaning implement consisting of an oily rag attached by a cord to a weight; is pulled through the barrel of a rifle or handgun to clean it.
pull-through (Verb) — Continue in existence after (an adversity, etc.). ex. "He pulled through the cancer against all odds"
pull-through (Verb) — Bring into safety. ex. "We pulled through most of the victims of the bomb attack"