ослабнуть – English translation

develop weakness; slack (о натянутой верёвке); slacken (о натянутой верёвке); relax; get weaker (Andrey Truhachev); become weaker (Andrey Truhachev); be weakening (Andrey Truhachev); come undone (Dimitriy_R); lose strength (об урагане мишас); grow loose; become weak; fail (of one’s eyesight, health, etc.); get worse; subside; come loose; break up

Gruzovik

fall off (= ослабеть; pf of слабнуть); diminish (= ослабеть; pf of слабнуть); decrease (= ослабеть; pf of слабнуть); abate (= ослабеть; pf of слабнуть); subside; loosen (= ослабеть; pf of слабнуть); become looser (= ослабеть; pf of слабнуть); become weak; of storm, wind, etc drop (= ослабеть; pf of слабнуть); grow weak (= ослабеть; pf of слабнуть); relax (= ослабеть; pf of слабнуть); grow weaker (= ослабеть; pf of слабнуть)

Игорь Миг

get loose; work loose

Gruzovik, inf.

become slack (impf of ослабнуть)

inf.

become slack; grow weak; grow weaker

math.

Interest in this waned in the late 1970s