There are 3 main definitions of loon in English:

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loon 1

Syllabification: loon

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.

Words that rhyme with loon

afternoon, attune, autoimmune, baboon, balloon, bassoon, bestrewn, boon, Boone, bridoon, buffoon, Cameroon, Cancún, cardoon, cartoon, Changchun, cocoon, commune, croon, doubloon, dragoon, dune, festoon, galloon, goon, harpoon, hoon, immune, importune, impugn, Irgun, jejune, June, Kowloon, lagoon, lampoon, macaroon, maroon, monsoon, moon, Muldoon, noon, oppugn, picayune, platoon, poltroon, pontoon, poon, prune, puccoon, raccoon, Rangoon, ratoon, rigadoon, rune, saloon, Saskatoon, Sassoon, Scone, soon, spittoon, spoon, swoon, Troon, tune, tycoon, typhoon, Walloon

Definition of loon in:

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There are 3 main definitions of loon in English:

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loon 2 Syllabification: loon

noun

North American
Image of loon
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.

Definition of loon in:

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There are 3 main definitions of loon in English:

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loon 3 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
More example sentences
  • Then again, the man who turned looning into a full-time career generally looks quite vacant.
  • I had looned and lazied my way through physical childhood and the misfortune of a crazed adolescence.
  • We'd set the bands gear up and generally idle the afternoon away in the bar playing pool, looning around on the beach, and hanging out in various cafés dotted around town before the serious business of playing heavy metal started in the evening.

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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