put your foot down idiom
C2 利用…的权力制止
to use your authority to stop something happening
When she started borrowing my clothes without asking, I had to put my foot down. 她开始连问都不问就把我的衣服借走的时候，我不得不出面制止。
UK踩油门，加速行驶
to increase your speed when you are driving
The road ahead was clear, so I put my foot down. 前面道路畅通，所以我猛踩油门。