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.
To cease to be brisk or active; to become dull or inactive; as, commerce stagnates; business stagnates.
stagnate in Dutch is stilstaan, stagneren
stagnate in French is stagner, stagnons, stagnent, stagnez
stagnate in German is stagniere, stagnieren
stagnate in Spanish is estancarse
stagnate in Swedish is stocka sig, stagnera