soften

Etymology

From Middle English softenen, softnen, equivalent to soft + -en.

verb

1. (transitive) To make something soft or softer.
   Soften the butter before beating in the sugar.
2. (transitive) To undermine the morale of someone (often soften up).
   Before the invasion, we softened up the enemy with the artillery.
3. (transitive) To make less harsh
   Having second thoughts, I softened my criticism.
   I have recently reclad the south-west facing side of my single-storey cottage […]. I now want to plant some climbers of more manageable proportions to soften the building. 7 February 2015, Helen Yemm, “Thorny problems: How can I soften a brick wall with plants?”, in The Daily Telegraph (London), page G7
4. (intransitive) To become soft or softer
   The butter softened as it warmed up.
5. (transitive, intransitive, phonology) To become or make (a consonant) more lenis, to lenite.
6. (Slavic phonology) To palatalize.