stag·nate /ˈstægˌnet/
  (vt.)(vi.)(使)淤塞,(使)停滯,(使)沈滯,(使)變蕭條
  Stag·nate v. i. [imp. & p. p. Stagnated p. pr. & vb. n. Stagnating.]
  1. To cease to flow; to be motionless; as, blood stagnates in the veins of an animal; hence, to become impure or foul by want of motion; as, air stagnates in a close room.
  2. To cease to be brisk or active; to become dull or inactive; as, commerce stagnates; business stagnates.
     Ready-witted tenderness . . . never stagnates in vain lamentations while there is any room for hope.   --Sir W. Scott.
  Stag·nate a. Stagnant. [Obs.] “A stagnate mass of vapors.”
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  stagnate
       v 1: stand still; "Industry will stagnate if we do not stimulate
            our economy"
       2: cause to stagnate; "There are marshes that stagnate the
          waters"
       3: cease to flow; stand without moving; "Stagnating waters";
          "blood stagnates in the capillaries"
       4: be idle; exist in a changeless situation; "The old man sat
          and stagnated on his porch"; "He slugged in bed all
          morning" [syn: idle, laze, slug] [ant: work]