Bīngdòng-sānchǐ, fēi yí rì zhī hán, tāmen de máodùn jīlěi yǐ jiǔ.
Three feet of ice doesn't form in one day - their conflict has been building for a long time.
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Short form of 冰冻三尺，非一日之寒 ('three feet of ice isn't the cold of a single day'). Usually the full form is quoted; the half form is a conversational trigger that expects the listener to complete it mentally.
