tranquilise

Example:He took deep breaths to calm himself down before the presentation.

Definition:To make someone feel peaceful and less worried or disturbed.

Example:The cool, gentle water from the stream helped to soothe her anxious mind.

Definition:To make someone feel better or less upset.

Example:The teacher used a loud clap to quieten the noisy classroom.

Definition:To make someone or something less noisy, loud, or active.