quiet as a lamb
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(as) quiet as a lamb
Silent, meek, and gentle. I just can't believe that Kate actually yelled at Mike—she's quiet as a lamb! My son, usually so boisterous, always goes as quiet as a lamb during church.
quiet as a lamb
If someone is quiet as a lamb, they are very quiet, calm, or gentle. She's fine, quiet as a lamb. You really mustn't worry. As soon as the organ music began to play, Ellie went quiet as a lamb.