ahuldu Englisch:

Drugs weaken your concentration.

Which illnesses weaken the immune system? The flu weakens the immune system.

to weaken sb's resolve - osłabić kogoś w jego postanowieniu

We know that prolonged exposure to vibration can weaken aircraft components.

Passions weaken, but habits strengthen, with age.

As expectation increases that the dollar will weaken, the foreign exchange market's reaction to US economic indicators has been fairly muted.