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Related to quiet down: keep quiet
1. To become calm, quiet, and relaxed; to stop being so noisy and boisterous. A small amount of television after dinner is actually a good way of helping kids quiet down before bed time. It takes the engine a minute to quiet down after you turn it off.
2. To cause, compel, or instruct someone or something to become less noisy and boisterous. In this usage, a noun or pronoun is used between "quiet" and "down." A last-minute goal by the visiting team quieted the crowd down almost instantly. It can be a real chore unto itself trying to quiet the students down first thing in the morning.
quiet (someone or an animal) down
to make someone or an animal more quiet. Please go and quiet the children down. Try to quiet down the children. Please quiet that dog down.
to become quiet; to become less noisy. Please quiet down. Ask them to quiet down.
1. To become less noisy or more relaxed; calm down: When the class quiets down, we can proceed. Quiet down now.
2. To cause someone or something to become less noisy or more relaxed: Please quiet down those children or you will have to leave. We need to quiet the dogs down.