Siblings play, laughter fills air.
Meaning: Brothers and sisters are engaging in an activity that brings them joy and causing the area around them to be filled with the sound of their happiness.
Choice of Words: Siblings are brothers and sisters. Play means to engage in an activity for enjoyment. Laughter is the act of making a sound when you find something funny or enjoyable. Fills means to make something full or complete. Air is the mixture of gases that surrounds the Earth.
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Related Expressions