1. [late 15C+] a man or boy; a commoner as distinct from a gentleman.
2. [late 17C] a general term of abuse.
3. [mid-18C+] as a term of address to a man [20C+ usage is primarily US].
4. [mid-19C] (Anglo-Ind.) a sepoy.
5. [mid-19C+] (US, also country jack) a rustic, a peasant; a simpleton [underpinned by jake n.1 (1)].
6. see jack tar n.2
[late 19C–1910s] a blunt person.
[early 19C] the ‘boots’ or bootboy at an inn.
[mid–late 16C] a boaster, a braggart.
[late 18C–mid-19C] (UK Und.) a dirty, contemptible man.
[17C] a foolish person.
[late 17C–18C] a man of low birth or manners who has pretensions to be a gentleman, an insolent fellow, an upstart.
[late 18C] a large masculine woman.
[20C+] (Irish) a discreet person; esp. in the phr. between you and me and jack mum.
[mid–late 19C] a sneaking, slovenly person.
[19C] the vagina.
[early 18C–mid-19C] a derog. term for a Roman Catholic.
[1930s–40s] (US) a slow, listless person.
[mid-17C–1910s] a jester or clown, travelling with a mountebank or itinerant quack .
[mid-19C] (UK Und.) a sneak-thief.
[mid-16C–early 18C] a saucy or impudent fellow.
[mid-16C–mid-17C] a meddlesome or interfering person, a busybody.
[late 16C–17C] a nonentity, lit. a ‘man of straw’.
1. [mid-17C] in pl., the testicles.
2. [late 18C–19C] a fat man.
1. [mid-18C–mid-19C] a large, tough prostitute .
2. [mid-19C–1920s] a womanizer.
[mid-19C–1900s] a very fat man [obs. SE bonehouse, the human body].
1. [late 17C–mid-19C] a temporary clergyman, hired when the regular incumbent is absent.
2. [mid-19C] one who is required only in an emergency or as a gapstop; thus an insignificant person.
3. [late 19C] an odd-job man.
[mid-19C] (UK Und.) a friend in need.
[19C] a pretender, an upstart.
[mid–late 19C] a waterman’s attendant, who helps passengers on and off boats.
[19C] (US) a good fellow, man.
[late 14C–17C] a Dover sole.
1. a tall, long-legged man.
2. an outsize clasp-knife.
[17C] (UK Und.) a confidence trickster, specializing in selling supposedly purpose-written pamphlets, poems etc, which flatter the vanity of the purchaser but which are, in fact, mass-produced with a personalized dedication tacked on.
[late 16C–17C] a vagrant, one who has been thrown out of his house.
[mid-19C] (UK Und.) a policeman.
[1920s–30s] (US tramp) a one-legged, one-armed or one-eyed beggar.