To grab or seize by the collar or neck.
To place a collar on, to fit with one.
Collar and leash aggressive dogs.
To seize, capture or detain.
To preempt, control stringently and exclusively.
(law enforcement) To arrest.
To bind in conversation.
I managed to collar Fred in the office for an hour.
To roll up (beef or other meat) and bind it with string preparatory to cooking.
(BDSM) To bind (a submissive) to a dominant under specific conditions or obligations.
Having a collar (or other encircling demarcation).