less·en 
/ˈlɛsn̩/ verb
less·ens; less·ened; less·en·ing /ˈlɛsn̩/ verb : to become less or to cause (something) to become less [no obj] ▪ The pain will lessen [=decrease] over time. [+ obj] ▪ Medication helps lessen the severity of the symptoms. ▪ Taking a few simple precautions will lessen [=(more commonly) reduce] your risk of injury.
