A discourse marker used to introduce a contrast or qualification equivalent to "however," "on the other hand," or "nevertheless."
A phrase used to add a modifying remark that limits, balances, or qualifies a preceding statement.
2.
USUKgeneral Englishinformalconversational
Used to introduce a reconsideration or correction of what was just said, often signaling a change of mind or an added caveat (synonymous with "having said that").