keep down
Keep from progressing or growing; keep within limits; control.
The children could not keep their voices down.
We hoe the garden to keep down the weeds.
You can't keep a good man down.
keep one's own counsel
To keep your ideas and plans to yourself.
John listened to what everyone had to say in the discussion, but he kept his own counsel.
Although everybody gave Mrs. O'Connor advice about what to do with her house, she kept her own counsel.
kick down
To shift an automobile, jeep, or truck into lower gear by hand-shifting.
Joe kicked the jeep down from third to second, and we slowed down.
knock down
To reduce; lower.
The realtors said that if we decided to buy the house, they would knock the price down by 10%.
know one's own mind
To no hesitate or vacillate; be definite in one's ideas or plans.
It is impossible to do business with Fred, because he doesn't know his own mind.
lay down one's arms
To cease fighting; surrender.
The Civil War ended when the Confederate army finally laid down its arms.
lay down one's life
To sacrifice one's life for a cause or person; suffer martyrdom.
The early Christians often laid down their lives for their faith.
lay down the law
To give strict orders.
The teacher lays down the law about homework every afternoon.
To speak severely or seriously about a wrongdoing; scold.
The principal called in the students and laid down the law to them about skipping classes.