1550s, "severe toil, hard work, drudgery;" from slave (v.) + -ery. Meaning "state of servitude" is from 1570s; meaning "keeping or holding of slaves" is from 1728.
1550s, "to enslave," from slave (n.). The meaning "work like a slave" is attested by 1719. Related: Slaved; slaving.
"favoring slavery; siding with the political interests of slaveholders," 1825, from pro- + slavery.