hold the reins
US /hoʊld ðə reɪnz/
UK /hoʊld ðə reɪnz/

1.
memegang kendali, mengendalikan
to be in control of something, especially an organization or a country
:
•
She's the one who truly holds the reins in this company.
Dialah yang benar-benar memegang kendali di perusahaan ini.
•
After the election, the new party will hold the reins of government.
Setelah pemilihan, partai baru akan memegang kendali pemerintahan.