Meaning of “stagnate” - Learner’s Dictionary

stagnate

verb [ I ] uk us /stæɡˈneɪt/ US  /ˈstæɡneɪt/

to stay the same and not grow or develop:

He expects the economy to stagnate and unemployment to rise.
stagnation uk us /stæɡˈneɪʃən/ noun [ U ]

(Definition of “stagnate” from the Cambridge Learner’s Dictionary © Cambridge University Press)