Etymology
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free-soil (adj.)

in U.S. history, "opposed to expansion of slavery into the territories," 1846, from free soil (n.) in reference to settled regions without slavery, from free (adj.) + soil (n.). Related: Free-soiler.

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Definitions of free-soil

free-soil (adj.)
where slavery was prohibited;
a free-soil state
Synonyms: slaveless / non-slave
From wordnet.princeton.edu