1. visual resemblance.
(a) [early 16C–mid-17C] the hangman’s noose.
(b) [20C+] the foam on a glass of beer.
(c) [1950s+] (drugs) in a makeshift syringe, the strip of paper wrapped around a dropper to ensure a tight fit with the needle.
2. [mid-19C–1900s; 1960s+] legitimate work; i.e. that in which one wears a SE collar (the original image may have referred to working horses).
3. (US) from collar v.
(a) [late 19C] in fig. use of sense 3b, any kind of restraint, e.g. marriage.
(b) [late 19C+] an arrest; thus give the collar v.
(c) [late 19C+] a police officer.
(d) [1970s+] the person who has been arrested.
[late 18C–early 19C] the day of execution.
[1940s+] (UK Und./police) to be arrested.
1. [mid-19C–1910s] unemployed.
2. [1900s] (Aus.) disinherited.
[mid-19C] (US) to arrest.
[1900s–20s] (Aus.) an easy job.
SE in slang uses
[1920s–30s] (US) family style, informal, esp. of a restaurant or café.
[1910s] (US prison) a collar and tie.
[1940s+] a masculine lesbian; also attrib.
see cuffs and collars under cuff n.2
[late 19C] hard, strenuous work.
[late 19C] (US) to perform adequately, to come up to expectations.
[20C+] (US) to start working, to work hard.
[late 19C–1900s] to put on airs.
1. [mid–late 19C] to stay hard at work, or to make someone else stay hard at work.
2. [1910s–20s] to be overwhelmed by one’s work.
[late 19C+] (Irish) to put in very great difficulties, to be stretched to the limit.