stagnate
/ˈstæɡneɪt, -ˌneɪt/Definitions
1. verb
to become or remain in a state of little or no change or progress; to become inactive or useless
“The economy stagnated due to a lack of investment.”
2. verb
to stop flowing or moving, especially water
“The river began to stagnate in the summer months.”
3. noun
a state of little or no change or progress
“The stagnation of the economy led to widespread unemployment.”
4. noun
a pool of stagnant water
“The doctor told her to avoid the stagnate area near the lake.”