Pronunciation: (stag'nāt), [key]
—v.i., -nat•ed, -nat•ing.
1. to cease to run or flow, as water, air, etc.
2. to be or become stale or foul from standing, as a pool of water.
3. to stop developing, growing, progressing, or advancing: My mind is stagnating from too much TV.
4. to be or become sluggish and dull: When the leading lady left, the show started to stagnate.
to make stagnant.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.