English ⇄ Russian

hit a plateau stresses
gen.	достичь плато (to) stop growing or improving at something – from phrasemix.com Tamerlane); выйти на плато (When tackling any long-term goal, you will inevitably hit a plateau. – NYT diyaroschuk)
O&G	выполаживаться (grafleonov); выполаживать (grafleonov)
sport.	затормозить (One of the most frustrating things about training is when you hit a plateau and it seems like you cannot progress any further Julchonok)