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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";
   - idle, laze, slug [informal]

Derived forms: stagnating, stagnates, stagnated

Type of: be, change