hideI'll need to hide the sweets so the children don't find them.
concealHe did his best to conceal his true feelings from his spouse.
secreteformalThe spies smuggled the films out of the country by secreting them in the lining of their coats.
cloakThe proceedings were cloaked in secrecy.
shroudThe whole valley was shrouded in darkness.
be shrouded in secrecy/mysteryThe whole affair was shrouded in secrecy.
maskVinegar masked the smell of cigarette smoke.
paper over somethingThe university tried to paper over the financial scandals, but eventually the local press caught on.