Lessen
Definition 1 of 2
Pro Tip 1/3
Action Oriented
Use 'lessen' when describing an intentional action to reduce something. She took measures to lessen environmental damage.
Pro Tip 2/3
Mitigate Effects
'Lessen' is often used when talking about making negative effects not as severe. Wearing a helmet can lessen the chance of a head injury.
Pro Tip 3/3
Progressive Change
Use 'lessen' to imply a gradual reduction over time, rather than immediate. Her attention to detail lessened as she grew tired.