九年囚七年痒
[jiŭ nián qiú qī nián yăng]
The phrase 'Nine-year prisoner, seven-year itch' suggests the feeling during a long marriage or committed relationship. Nine years of being a 'prisoner' may imply confinement in a relationship, while the 'seven-year itch' refers to restlessness after seven years. It hints at challenges within a long-term partnership.