verb

• (transitive) To disturb the relative position of the particles (of a liquid or similar) by passing an object through it.
  "She stirred the pudding with a spoon."
• (transitive) To disturb the content of (a container) by passing an object through it.
  "Would you please stir this pot so that the chocolate doesn't burn?"
• (transitive) To emotionally affect; to touch, to move.
  "And what delights can equal those ⁠That stir the spirit’s inner deeps, ⁠When one that loves but knows not, reaps A truth from one that loves and knows?"
• (transitive) To incite to action.
  "An Ate, stirring him to bloud and strife […]"

noun

• (slang) Jail; prison.
  "He's going to be spending maybe ten years in stir."

noun

• (finance) Acronym of short-term interest rate, often referring to a short-term interest rate future or option.