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/
"have (got) someone by the short and curlies" picture
1.

держать кого-то за яйца, иметь кого-то в полной власти

(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.
Компания держала его за яйца после того, как он подписал этот контракт.
She knew his secret, so she had him by the short and curlies.
Она знала его секрет, поэтому держала его за яйца.