verb

• (intransitive, copulative, of a person) To be in a position in which the upper body is upright and supported by the buttocks.
  "He is so fayre, withoutten les, / he semys full well to sytt on des."
• (intransitive, of a person) To move oneself into such a position.
  "I asked him to sit."
• (intransitive, of an object) To occupy a given position.
  "The dishes are still sitting on the table!"
• (intransitive, copulative) To remain in a state of repose; to rest; to abide; to rest in any position or condition.
  "And Moses said to […] the children of Reuben, Shall your brothren go to war, and shall ye sit here?"

noun

• (mining) Subsidence of the roof of a coal mine.
• (rare, Buddhism) An event, usually lasting one full day or more, where the primary goal is to sit in meditation.

noun

• (informal) Clipping of situation.
  "The increasing scope of the disaster was relayed in short, terse sentences whose brevity does not conceal the unfolding nightmare. […] In mid-afternoon at 1600: “Sit is getting worse; need help badly,” “have considerable number of wounded that are unable to evacuate.”"

noun

• (telecommunications) Initialism of special information tone.
• (India) Initialism of Special Investigation Team.