- to cease to run or flow, as water, air, etc.
- to be or become stale or foul from standing, as a pool of water.
- to stop developing, growing, progressing, or advancing: My mind is stagnating from too much TV.
- to be or become sluggish and dull: When the leading lady left, the show started to stagnate.
- to make stagnant.
- to be or to become stagnant