noun

1. the part of a garment that encircles the neck
2. a cloth band or folded-over piece attached to the neck of a garment
3. an ornamental band, chain, or circlet worn around the neck
4. a band of leather or metal for the neck of a dog, cat, etc.
5. the part of the harness which fits around the base of the neck of a horse or other draft animal and against which the animal exerts pressure in pulling a load
6. a ring or flange, as on rods or pipes, to prevent sideward motion, connect parts, etc.
7. a distinctive band, as of a different color or texture, around the neck of an animal, bird, etc.
8. the foam that forms on the top of a glass of beer
9. ☆ Slang an arrest or capture

Etymology: ME coler < OFr colier < L collare, band or chain for the neck < collum, the neck < IE base *kwel-, to turn > wheel, Ger hals, neck

transitive verb

1. to put a collar on
2. to seize by the collar
3. Informal
   1. to take hold or control of; seize or capture
   2. to stop and delay by talking to