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.
Be embarrassed and ashamed when one has been defeated or failed
After losing that game, she had her tail between her legs.