Green’s Dictionary of Slang

sack v.

1. in senses of taking or placing ‘in a sack’.

(a) [late 18C+] to rob, to steal, to take possession of, to pocket.

(b) [19C] to put in one’s pocket.

(c) [1940s] (US Und.) to sort out, to arrange.

2. in senses of dismissal.

(a) [mid-19C+] to dismiss someone from a job.

(b) [mid-19C+] (also sack off) to reject or dismiss something or someone.

(c) [mid-19C+] to expel from school or university.

(d) [1970s+] to end a relationship with, esp. in an abrupt, brutal manner.

(e) [1980s] (US campus) to humiliate someone.

(f) [1980s+] (Aus. prison) to ostracize.

3. [1930s–50s] (US Und.) to tie someone up with the cord round their limbs and throat; they are then placed in a sack and when they struggle to get free they will asphyxiate themselves.

4. to allot a sleeping place.

In phrases

sack (down) (v.)

[1940s+] to go to bed, to sleep.

sacked out (adj.)

[1940s+] fast asleep.

sack in (v.)

1. [1940s+] (US) to go to bed, to sleep.

2. [1960s] to lie in, to stay in bed.

sack it up (v.)

[1970s–80s] (US black) to terminate, to bring to a conclusion.

sack off (v.)

see sense 2b above.

sack out (v.)

[1940s+] to fall asleep, to go to bed.

sack up (v.)

1. [1920s+] (US) to go to bed.

2. [2000s] (US) to be quiet.

SE in slang uses

In phrases

sack ’em up (man) (n.) [the corpse is placed in a sack before its delivery to a hospital]

[mid-late 19C] a resurrectionist or grave-robber.

sack up (v.)

1. [1990s+] (US campus) to survive a challenging situation [? one places it in a fig. SE sack].

2. [2000s] (drugs) to divide up and place bulk drugs into separate bags prior to sale.

In exclamations

sack it!

[1980s+] be quiet!