Definitions

1. verb

to make something less intense or severe; to weaken or reduce the force or effect of something

“The rain would slighten the impact of the storm.”

2. verb

to make something slightly worse or more severe; to increase the force or effect of something slightly

“The cold wind would slighten the traveler’s condition.”

3. verb

to make something slightly less severe or intense

“The medicine would slighten the symptoms.”