Slacken(verb)
Meaning: To become gradually less strong or slower, or to make something do this.
Hindi meaning:मंद करना; निर्बल करना
Synonyms: Slow Down, Decelerate, Subside, Wane
Antonyms: Speed Up, Quicken, Accelerate
Example: Growth in the economy was beginning to slacken off.
Trick to remember: Slow slow weaken hona slacken hota h 
