Etymology
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collar (n.)

c. 1300, coler, coller, "neck armor, gorget, something worn about the neck," from Old French coler "neck, collar" (12c., Modern French collier), from Latin collare "necklace, band or chain for the neck," from collum "the neck," from PIE *kwol-o- "neck" (source also of Old Norse and Middle Dutch hals "neck"), literally "that on which the head turns," from root *kwel- (1) "revolve, move round."

The spelling was re-Latinized in early modern English. From late 14c. as "border at the neck of a garment," also "band put around the neck of a dog or other animal for purposes of restraint or identification." From mid-15c. as "neck-band forming part of the harness of a horse or other draught-animal."

collar (v.)

1550s, "to grab (someone) by the collar or neck," from collar (n.). Meaning "to capture" is attested from 1610s. Meaning "put a collar on" is from c. 1600. Related: Collared; collaring. As a past-participle adjective, collared "wearing a collar" is from late 14c.

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Definitions of collar
1
collar (n.)
a band that fits around the neck and is usually folded over;
Synonyms: neckband
collar (n.)
(zoology) an encircling band or marking around the neck of any animal;
collar (n.)
anything worn or placed about the neck;
a collar of flowers was placed about the neck of the winning horse
the thief was forced to wear a heavy wooden collar
collar (n.)
a short ring fastened over a rod or shaft to limit, guide, or secure a machine part;
collar (n.)
the stitching that forms the rim of a shoe or boot;
Synonyms: shoe collar
collar (n.)
a band of leather or rope that is placed around an animal's neck as a harness or to identify it;
collar (n.)
necklace that fits tightly around a woman's neck;
Synonyms: choker / dog collar / neckband
collar (n.)
a figurative restraint;
asked for a collar on program trading in the stock market
Synonyms: leash
collar (n.)
the act of apprehending (especially apprehending a criminal);
the policeman on the beat got credit for the collar
Synonyms: apprehension / arrest / catch / pinch / taking into custody
2
collar (v.)
take into custody;
Synonyms: nail / apprehend / arrest / pick up / nab / cop
collar (v.)
seize by the neck or collar;
collar (v.)
furnish with a collar;
collar the dog
From wordnet.princeton.edu