(idiom) like a hot knife through butter; describes a situation where one gains victory after victory or progresses with overwhelming momentum once a breakthrough is made

(idiom) like the force used to smash bamboo; an overwhelming momentum that is impossible to stop, specifically when referring to a military advance or the progress of work

(idiom) describes a situation that is progressing smoothly and without resistance; literally "smash bamboo and overturn a water jug"