There are 3 main definitions of loon in English:

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loon1

Syllabification: loon
Pronunciation: /lo͞on
 
/

noun

informal
A silly or foolish person.
Example sentences
  • Prizes should be delivered to the TV director who cut to their box in time to catch him grinning like a loon, boffing a balloon about with his feet and hands.
  • Here, a sheepish young yakuza is ordered to kill his insane boss but things go awry when his elder disappears in a town full of loons, zombies, and halfwits.
  • And for another, hanging them on your lapel makes you look like a dork, or worse yet a loon.
Synonyms

Origin

late 19th century: from loon2 (referring to the bird's actions when escaping from danger), perhaps influenced by loony.

More
  • This word for ‘a silly person’ comes from the North American loon (mid 17th century), a large water bird also known as a diver. It gets its name from its distinctive cry. The sense silly is from the bird's actions when escaping from danger; perhaps influenced by loony, a mid 19th-century abbreviation of lunatic (Middle English) from Latin luna ‘moon. In the past people thought that the phases of the moon could affect people.

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There are 3 main definitions of loon in English:

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loon2

Syllabification: loon
Pronunciation: /
 
lo͞on/

noun

North American
A large diving waterbird with a sleek black or gray head, a straight pointed bill, and short legs set far back under the body. Loons breed by lakes in northern latitudes and have wailing calls.
  • Family Gaviidae and genus Gavia: five species, including the common loon (G. immer) of both Canada and Eurasia
Example sentences
  • All other birds, from loons and penguins to woodpeckers and sparrows, are placed together in the third main lineage, the Neoaves.
  • Some interesting exceptions to the correlation between body size and pneumaticity occur in birds that dive underwater to feed, such as grebes, loons, and penguins.
  • In modern divers, such as the penguin and loon, the wings are also shaped so that the surface presented to the water is a smooth, hydrodynamic curve.

Origin

mid 17th century: probably by alteration of Shetland dialect loom, denoting especially a guillemot or a diver, from Old Norse.

More
  • This word for ‘a silly person’ comes from the North American loon (mid 17th century), a large water bird also known as a diver. It gets its name from its distinctive cry. The sense silly is from the bird's actions when escaping from danger; perhaps influenced by loony, a mid 19th-century abbreviation of lunatic (Middle English) from Latin luna ‘moon. In the past people thought that the phases of the moon could affect people.

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There are 3 main definitions of loon in English:

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loon3

Line breaks: loon

Entry from British & World English dictionary

verb

[no object, with adverbial] British informal
Act in a foolish or desultory way: he decided to loon around London

Origin

1960s: of unknown origin.

More
  • This word for ‘a silly person’ comes from the North American loon (mid 17th century), a large water bird also known as a diver. It gets its name from its distinctive cry. The sense silly is from the bird's actions when escaping from danger; perhaps influenced by loony, a mid 19th-century abbreviation of lunatic (Middle English) from Latin luna ‘moon. In the past people thought that the phases of the moon could affect people.

Definition of loon in:

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