осла́бнуть

Very rarely used word (top 20,000)

Verb aspects

Imperfective (ongoing or repeatedly):

To weaken

Perfective (completed or one-time):

to weaken

Си́ла мои́х мышц осла́бла из-за недоста́тка упражне́ний.My muscular strength has weakened from lack of exercise.
Европе́йские валю́ты осла́бли по отноше́нию к до́ллару.European currencies weakened against the dollar.
Его дыха́ние осла́бло.His breathing became faint.
С во́зрастом он осла́б.He has become weaker with age.
Ветер осла́б.The wind has abated.
Лихора́дка осла́бла.The fever has abated.

Imperative
ты	осла́бни
вы	осла́бните