Minimalize
Minimisation is a type of deception involving denial coupled with rationalisation in situations where complete denial is implausible. It is the opposite of exaggeration. Minimization—downplaying the significance of an event or emotion—is a common strategy in dealing with feelings of guilt. Words associated with minimisation include:
Wikipedia
Minimalize (verb)
To reduce to a minimum.
Minimize (verb)
To make (something) as small or as insignificant as possible.
Minimize (verb)
To remove (a window) from the main display area, collapsing it to an icon or caption.
“I didn’t close anything, but I minimized all the windows so I could see the desktop.”
Minimize (verb)
To treat (someone) slightingly.
Wiktionary