a rat in a hole
Turtle in a urn, a Chinese idiom, Pinyin is w è ngzh ō ngzh ī Bi ē. It means something that is under control and cannot escape. From Yu Shi Ming Yan.
The origin of Idioms
Feng Menglong of Ming Dynasty wrote a general statement of warning the world: "Sun Fu regarded the ten niangs as turtles in the urn, and ordered his children to send the gold writing stationery and put it on the bow of the boat."
Idiom usage
These little Southern barbarians are just a few. They don't have to spend a lot of money. They have to be disciplined one by one. (Chapter 76 of the complete biography of Shuoyue by Qian Cai in Qing Dynasty)
Analysis of Idioms
Catch a turtle in a jar
a rat in a hole
strike where or when the enemy is unprepared - gōng qí wú bèi
cannot put the responsibility on others - fēi yì rén rèn
Things will return to the extreme - wù jí bì fǎn
Without skin, how can hair be attached - pí zhī bù cún,máo jiāng yān fù