Have a tight rein on (someone or something) spoken language verb phrase
Used to describe controlling someone or something carefully.
Because Jane's gonna have a baby, she has to have a tight rein on spending.
Do you think that our mother quite has a tight rein on us?
Because I'm losing weight, I have to have a tight rein on my diet.
The doctor asked me to have a tight rein on my intake to heal my wound faster.
It's mostly used in the present tense.
To make love or have sex with someone
They just jumped each other’s bones after one date.