Stagnate (verb)
stagnate [stag-neyt] (previously 02-12-13)

verb (used without object), stagnated, stagnating.
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.

verb (used with object), stagnated, stagnating.
5. to make stagnant.

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Origin: 1660-70; < Latin stāgnātus (past participle of stāgnāre), equivalent to stāgn(um) pool of standing water + -ātus -ate

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