Collocations for weaken - verb

considerably, greatly, seriously, severely, significantly, substantially | fatally
The regime was fatally weakened by the unrest and violence.

further | slightly, somewhat | gradually, progressively
Central authority has been progressively weakened since the outbreak of the civil war.

permanently

begin to | serve to
The division of Germany had served to weaken the party.

tend to | be designed to
an unusual move designed to weaken the rebels