Collocations for weaken - verb

considerably, greatly, seriously, severely, significantly, substantially
badly
The military was badly weakened by the sanctions.

fatally
The regime was fatally weakened by the unrest and violence.

dramatically
exchange rates that dramatically weakened the dollar

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

permanently
eventually, ultimately
The storm eventually weakened.

begin to, start to
continue to
The British pound continued to weaken against the dollar.

serve to
The judgement serves to weaken public confidence in the courts.

attempt to, try to
tend to
threaten to
be designed to
a move designed to weaken the rebels

Weaken is used with these nouns as the subject:
knee

Weaken is used with these nouns as the object:
accountability, argument, belief, bond, case, confidence, defence, economy, hold, impact, institution, link, muscle, opposition, party, support, system, tie