collar up

Meanings

1. 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. To build up a lip or collar around a hole.
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.