To slip the collar

Collar Col"lar, n. [OE. coler, coller, OF. colier, F. collier, necklace, collar, fr. OF. col neck, F. cou, fr. L. collum; akin to AS. heals, G. & Goth. hals. Cf. {Hals}, n.] 1. Something worn round the neck, whether for use, ornament, restraint, or identification; as, the collar of a coat; a lady's collar; the collar of a dog. [1913 Webster]

2. (Arch.) (a) A ring or cincture. (b) A collar beam. [1913 Webster]

3. (Bot.) The neck or line of junction between the root of a plant and its stem. --Gray. [1913 Webster]

4. An ornament worn round the neck by knights, having on it devices to designate their rank or order. [1913 Webster]

5. (Zo["o]l.) (a) A ringlike part of a mollusk in connection with esophagus. (b) A colored ring round the neck of a bird or mammal. [1913 Webster]

6. (Mech.) A ring or round flange upon, surrounding, or against an object, and used for restraining motion within given limits, or for holding something to its place, or for hiding an opening around an object; as, a collar on a shaft, used to prevent endwise motion of the shaft; a collar surrounding a stovepipe at the place where it enters a wall. The flanges of a piston and the gland of a stuffing box are sometimes called collars. [1913 Webster]

7. (Naut.) An eye formed in the bight or bend of a shroud or stay to go over the masthead; also, a rope to which certain parts of rigging, as dead-eyes, are secured. [1913 Webster]

8. (Mining) A curb, or a horizontal timbering, around the mouth of a shaft. --Raymond. [1913 Webster]

{Collar beam} (Arch.), a horizontal piece of timber connecting and tying together two opposite rafters; -- also, called simply {collar}.

{Collar of brawn}, the quantity of brawn bound up in one parcel. [Eng.] --Johnson.

{Collar day}, a day of great ceremony at the English court, when persons, who are dignitaries of honorary orders, wear the collars of those orders.

{To slip the collar}, to get free; to disentangle one's self from difficulty, labor, or engagement. --Spenser. [1913 Webster]