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Related to but then: but then again
On the other hand; but after more careful consideration or from a different perspective. I always considered myself naturally athletic, but then, my parents had me involved in sports from a young age. She just seems constantly worn out, but then, she's trying to manage a business and raise her daughter single-handedly.
See also: but
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.