Collocations for lessen - verb

considerably, greatly, significantly
Eating a good diet significantly lessens the risk of heart disease.

somewhat
gradually
Time had gradually lessened the pain of her grief.

begin to
The noise began to lessen.

try to
tend to
Too much background detail tends to lessen the impact of the central image.

help (to)
Regular exercise can help lessen the pain.

Lessen is used with these nouns as the object:
anxiety, burden, chance, danger, discomfort, effect, impact, likelihood, load, pain, possibility, reliance, risk, stress