Meaning of “collar” - Learner’s Dictionary

collar

noun [ C ] uk us /ˈkɒlər/
CLOTHING

B1 the part of a shirt, coat, etc that is usually folded over and goes round your neck:

a shirt collar
ANIMAL

B2 a narrow piece of leather or plastic that you fasten round the neck of an animal

(Definition of “collar noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)