loon

US /luːn/
UK /luːn/
"loon" picture
1.

a silly or foolish person

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He's a bit of a loon, always telling crazy stories.
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Don't mind him, he's just a harmless old loon.
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foolidiotnuteccentriccrackpot
2.

a large, fish-eating diving bird of the northern hemisphere, with a straight, pointed bill and a haunting, yodeling cry

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We heard the distinctive cry of a loon across the lake.
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The loon is a symbol of the Canadian wilderness.