soften UK /ˈsɒfən/US /ˈsɔfən/verb 6forms 5phrases 3 verb6 •To make something soft or softer.Soften the butter before beating in the sugar. •To become soft or softer.The butter softened as it warmed up. •To make less harsh.Having second thoughts, I softened my criticism. •To undermine the morale of someone (often soften up).Before the invasion, we softened up the enemy with the artillery. •To become or make (a consonant) more lenis, to lenite. •To palatalize. formssoftened · softening · softeneth · softens · softenest Phrases with soften soften someone's coughTo completely negate or undermine someone's argument or position on a topic. soften the groundTo prepare or create favorable conditions (for something), especially with the intent of improving public acceptance of the forthcoming occurrence. soften upTo make softer.