noun
A soft or suppressed laugh
verb
To laugh quietly or inwardly
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As the professor finished his lecture, a few students couldn't help but chuckle at his dry sense of humor.
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I couldn't help but chuckle when I saw the video of the cat trying to fit into a tiny box.
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I let out a little chuckle when my friend tripped over his own feet.
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The old man chuckled to himself as he remembered the mischief he got into as a young boy.