have (got) someone by the short and curlies
US /hæv ɡɑt ˈsʌm.wʌn baɪ ðə ʃɔrt ænd ˈkɜr.liz/
UK /hæv ɡɑt ˈsʌm.wʌn baɪ ðə ʃɔrt ænd ˈkɜr.liz/

1.
完全掌控某人, 抓住某人的把柄
(informal, sometimes offensive) to have complete control over someone, especially by having an advantage over them or by knowing something about them that they want to keep secret
:
•
The company had him by the short and curlies after he signed that contract.
他簽了那份合同後,公司就完全掌控了他。
•
She knew his secret, so she had him by the short and curlies.
她知道他的秘密,所以完全掌控了他。