打破砂锅问到底dǎ pò shā guō wèn dào dǐdaposhaguowendaodito go to the bottom of things (idiom)Characters in this word到to go to, to arrive底bottom, underside打to attack, to beat, to hit, to strike砂sand, pebbles, gravel破to break, to rout锅cooking-pot, saucepan问to ask about, to inquire afterStudy it in Yanamino