V-ERG
（使）缩小；（使）减少；（使）减轻
If something lessens or you lessen it, it becomes smaller in size, amount, degree, or importance.
例句
He is used to a lot of attention from his wife, which will inevitably lessen when the baby is born...
他习惯了妻子对他的百般关注，但孩子出生后这种关注就会不可避免地减少。
Make sure that your immunisations are up to date to lessen the risk of serious illness.
要确保接种最新的疫苗，以降低患上严重疾病的危险。