gloss over
Word family
Synonym discussion
Sense: phrasal verb/1
Downplay is the closest synonym, but it is broader — you can downplay a problem by choosing not to mention it, by using minimising language, or even by altering data. Gloss over is narrower: it always involves talking about the topic, but only briefly and without the necessary detail. Whitewash is far stronger and implies a dishonest cover-up (“the government whitewashed the corruption scandal” would mean hiding evidence), whereas gloss over may just mean an insufficient treatment. Sugarcoat adds the idea of making something sound nicer (“sugarcoat the bad news with a smile”), while gloss over skips the unpleasant part altogether. Skim over describes hasty reading or teaching (“skim over chapter three”) and does not carry the critical force of gloss over.
Etymology
The verb gloss has historically meant “to give a smooth, shiny surface to” (from the noun gloss, meaning a bright shine on a surface). By the 1600s, English speakers began using gloss metaphorically: to gloss something was to give it a deceptively pleasant appearance, like painting over a crack. The phrasal verb gloss over appeared in the 17th century, describing the act of passing quickly over a fault or problem to make it seem less serious — as if giving it a smooth, shiny coat of paint to hide the flaw underneath.