To make or become refined, polite, and upper-class in manner or appearance.
From 'genteel' + '-ize' (to cause to become, to treat as), following the standard English pattern for verbs describing transformation into a desired state.
This verb is particularly fascinating in the context of social climbing history—it suggests that refinement is something that can be *learned* and *achieved*, not just inherited, which was revolutionary thinking for rigid class systems.
Complete word intelligence in one call. Free tier — 50 lookups/day.