1 to cover up (a shortcoming)

2 to screen off

3 to hide

4 to conceal

1 to blab

2 to shoot one's mouth off

3 to commit a gaffe

1 to cover (up)

2 to block

3 to obstruct

4 to shade

1 to cover

2 to mask

3 to cover up or conceal (the truth etc)

1 to shelter

2 to shelter from

1 to cover up the truth on all sides (idiom)

1 lit. hiding the sky and covering the earth (idiom); fig. earth-shattering

2 omnipresent

3 of universal importance

1 to be secretive; to try to cover up (idiom)