lessen是什么意思？

I didn't feel any improvement in my condition in the first couple of days, but after a few more regular visits to the doctor, my cough started to lessen.

It is urgent for governments to increase the cost of using fossil fuels to an appropriate level to lessen the catastrophic effects of climate change.

As a result, violations of the law and abuses of the intent of the law have lessened the financial rewards of authors, artists and producers.

International Labour Organization economists say some nations have come up with policies to lessen the impact of lower wages during the economic crisis.