collar

1 collar /ˈkɑːlɚ/ noun
plural collars
1 collar
/ˈkɑːlɚ/
noun
plural collars
Britannica Dictionary definition of COLLAR
[count]
1 
: a part of a piece of clothing that fits around a person's neck and is usually folded down
— see color picture on this page; see also blue-collar, pink-collar, white-collar
2 
: a band of leather, plastic, etc., worn around an animal's neck — see also flea collar
3 
technical : a ring or band used to hold something (such as a pipe or a part of a machine) in place

hot under the collar

— see 1hot
2 collar /ˈkɑːlɚ/ verb
collars; collared; collaring
2 collar
/ˈkɑːlɚ/
verb
collars; collared; collaring
Britannica Dictionary definition of COLLAR
[+ object] informal
1 
: to catch or arrest (someone)
2 
: to stop (someone) in order to talk : to force (someone) to have a conversation