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.
memegang kendali penuh atas seseorang, menguasai seseorang sepenuhnya
(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.
Perusahaan memegang kendali penuh atas dirinya setelah dia menandatangani kontrak itu.
•
She knew his secret, so she had him by the short and curlies.
Dia tahu rahasianya, jadi dia memegang kendali penuh atas dirinya.