“破口”的英语可以翻译为：crevasse，breach ...

水从管子的破口喷出来.Water was squirting out from a hole in the pipe.他却破口骂起医生来, 声音很轻, 但却很当真.He broke in cursing the doctor, in a feeble voice, but heartily.他破口乱骂的本领,也是卓越非凡的.In the matter of profanity he was sublime....