1
general::
Make attractive or acceptable by deception or superficial treatment. For example, His resumé glossed over his lack of experience, or She tried to gloss over the mistake by insisting it would make no difference. [Mid-1600s]
American Heritage Idioms
2
general::
Phrase(s): gloss over something
to cover up, minimize, or play down something bad. • Don’t gloss over your own role in this fiasco! • I don’t want to gloss this matter over, but it really isn’t very important, is it?
McGrawhill's American Idioms And Phrasal Verbs