Dezaggerate
To under-emphasize something. The opposite of exaggerate.
She totally dezaggerated how crazy her friend is.
dezaggerate
When someone exaggerates something backwards. Often used with the words like or so preceding it.
Man: Dude, I slept for like, two minutes last night.
Dude: C'mon man don't dezaggerate.
Man: Yeah OK I slept for an hour.
Dude: C'mon man don't dezaggerate.
Man: Yeah OK I slept for an hour.