Cover a multitude of sins
Here’s what it means
Love prevents many offenses from spreading, seeks forgiveness, and refuses to expose or inflame every wrong.
Why the Bible says it this way
An idiom is a familiar phrase whose meaning comes from the whole expression, not from reading each word by itself.
A helpful detail: The phrase does not mean hiding crimes, denying truth, or earning atonement. Context concerns restoring sinners and refusing needless strife.