splain

verb2

1. •
   (slang) To condescendingly explain something, often extensively, especially to someone that knows more about it; for example, to mansplain, whitesplain, etc.

   • Those who splain may have the intent of helping the situation, but the actual impact of their actions can feel condescending or insulting. — 2019
2. •
   (dialect, informal) Apheretic form of explain.

   • "Howsomever, dey 'ranged der 'fairs, en splained der bizness." — 1881