Someone who chuckles; a person who laughs in a quiet, suppressed, or amused way.
From 'chuckle' (to laugh softly) plus agent suffix '-er,' creating a noun for a person who performs the action of chuckling.
The word 'chuckler' is real but rarely used—instead, we just say 'someone who chuckled'—showing that English can create words perfectly grammatically that speakers simply never find useful!
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