tip over intosth
—phrasal verbwithtipverbuk/tɪp/us/tɪp/-pp-
If somethingtipsover from something into somethingelse, itstopsbeing the first thing, andbecomesthe second.
（由…）转变（为…）
Atvariouspointsin theplay, theactiontipsover fromcomedyintofarce(=stopsbeingfunnyandbecomesridiculous).这出戏中有好多地方，情节由喜剧变成了闹剧。