Daily Chinese Idiom Guessing Game
Extremely busy; unable to extricate oneself from a situation.
开打开，解开；交相错，纠缠。形容没法解开或摆脱。
清·姬文《市声》第二十四回两口子正在吵得不可开交。”
She was up to her neck in work and couldn't get away; it was a real '不可开交' situation.