“But it still comes out from time to time.”
Your friend is from the southern part of the U.S. He says that he used to have a strong Southern accent growing up, but he tries to suppress it. Then he says this.
But it still comes out from time to time.
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When you're trying to hide something, but it becomes revealed accidentally, you can say that it has "come out". For example:
He tries to act like he's all tough, but after you get to know him a little bit, his sweet side starts to come out.
The truth will come out.
Things that often "come out" include:
- a person's true personality
- an opinion that someone has been hiding
"From time to time" means "sometimes":
From time to time, I'll get a question from a customer about whether they can pay by check.
I make mistakes too from time to time.
"From time to time" seems like it's less often than "sometimes".
Use "still" to talk about things that:
- started in the past
- are still going on
- are continuing longer than you expected or hoped