The phrase "cover for" is a verb that means to help someone by providing an excuse or an alibi, especially to hide something wrong they did or to protect them from trouble.
When you "cover for" someone, you say or do something that makes it seem like they did not do something bad or wrong. It’s like protecting them from getting in trouble.
"I won’t lie and cover for you."
"She covered for her friend when he was late to work."
While "cover for" itself is quite direct, it can be part of larger expressions like: - "To cover someone’s back": This means to support someone and protect them from trouble.
"Cover up" can also be related but means to hide something completely, not just providing an excuse. For instance, "They tried to cover up the mistake."
Remember, "cover for" is about protecting someone from trouble by providing an excuse. You might use it in casual conversations about friends or in more formal discussions about work situations.