intensify heighten change sharpen enhance accelerate widen increase redouble compound normalize amplify enlarge strengthen broaden forge reinforce complicate vitalize undermine reaffirm develop underline solidify unite improve reinvigorate hinder expand stimulate aggravate internationalize speed raise condense quicken fan build erupt flare modernize deepening depolarization consolidate deaden strengthen nationalize revolutionize mutation further louden dinge bilateral nationalization immortalize transform immutable changeful cooperation relation rarefy resolve tie stiffen unchanging liberalize alteration mutate changer chasten transmute consolidate alter bolster demotion impetus cementing stability foster deepen rapprochement alliance neighborly prosperity interdependence transformation friendship unchanged transmutation stress mutual evolve reinforce steepen blur barbarize willingness secularization coarsen strive