'Cover up' in the Bible

No one sews a patch of unshrunk cloth onto an old garment; for what was intended to cover up [the hole] actually tears away [part of] the garment [i.e., when it shrinks], causing a bigger hole.

For we were never found using flattering words at any time, as you know, nor did we try to cover up any greedy desires. God can testify [to this].

As servants of God, you should live as free people, but do not use this freedom to cover up your wrongdoing.