collar up

verb6

1. •
   To apply a harness to a horse.
2. •
   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).
3. •
   To arrest (someone); to arrest one or more people.
4. •
   To put a collar on a dog (a band or chain around an animal's neck).
5. •
   To engage in a collar trade (taking equal but opposite positions in a put and a call with different strike prices).
6. •
   To build up a lip or collar around a hole.