legislate

"Legislate" is a back-formation from "legislation" and "legislator" — meaning English speakers had the nouns first and carved the verb out of them afterward, rather than the usual order of verb-then-noun.

Because it arrived backward, its very existence depended on "legislation" and "legislator" already being established words in English.

It's directly tied to "legislation" and "legislator," the two words it was quietly extracted from.