collar up
verb1
Equestrianism, Hobbies, Horses, Lifestyle, Pets, Sports To apply a harness to a horse.
2
To put a collar on a dog (a band or chain around an animal's neck).
3
Of a hole from To build up a lip or collar around a hole.
E.g.; a drill; e.g.; a drill
4
To raise the collar on a shirt or jacket (the part of an upper garment (shirt, jacket, etc.) that fits around the neck and throat).
5
To engage in a collar trade (taking equal but opposite positions in a put and a call with different strike prices).
6
To arrest (someone); to arrest one or more people.