put your foot down
to tell someone in a strong way that they must do something or that they must stop doing something

[TahlilGaran] Dictionary of Contemporary English ▲

insist to say firmly that someone should do something or that something should happen:
She insisted that it was her turn to drive.
demand to say very strongly and sometimes angrily that you want something or that something must happen:
I wrote a letter to the company, demanding an apology and a refund.
The guards demanded to see her ID.
require [usually passive] formal if you are required to do something, a rule or law says that you must do it:
The successful applicant will be required to sign a two-year contract.
be adamant to say very firmly that something must happen or is right, and refuse to change your mind when other people try to persuade you:
The actress has always been adamant about keeping her private life private.
won’t take no for an answer informal to insist that someone must do what you say or ask:
You’re coming home with me – I won’t take no for an answer.
put your foot down to say very firmly that someone must not do something:
Ed was talking about dropping out of school, but Mom and Dad put their foot down.

[TahlilGaran] English Thesaurus ▲

put your foot down
put (your) foot down
1.
to tell someone in a strong way that they must do something or that they must stop doing something.
You can't just let him do what he wants, you'll have to put your foot down.

When Anna came home drunk one afternoon I decided it was time to put my foot down.

2.
to suddenly increase your speed when you are driving.
The road ahead was clear, so I put my foot down and tried to overtake the car in front.

[TahlilGaran] English Idioms Dictionary ▲