掩盖

The fields were overspread with snow.

This perfume won't mask the unpleasant smell.

He is anxious to keep his misdeeds from coming to light.

Their differences were too wide to paper over.

smother (up) a crime

eclipse a truth

conceal one's intention

cover (up) one's tracks

sweep an issue under the carpet

cover up the facts; sink/shroud the facts; conceal/hide the facts

gloss over a flaw

whitewash an offence; smooth over/cover up/suppress one's fault

disguise one's motive

cover up one's mistake

cover/hush up a scandal; whitewash a scandal