tip over into something
phrasal verb with tip verb uk/tɪp/ us/tɪp/ -pp-
（由…）转变（为…）
If something tips over from something into something else, it stops being the first thing, and becomes the second.
At various points in the play, the action tips over from comedy into farce (= stops being funny and becomes ridiculous). 这出戏中有好多地方，情节由喜剧变成了闹剧。