Is the duplicate question flag being overused?
113626
"Close as duplicate" - what if only the answer is a duplicate?
9026
"Possible duplicate" notice not removed after reopening question
103254
What is the difference of closing for duplicate and flagging for duplicate?
97789
A Flag to close Questions from ongoing Contest
18551
Duplicate questions in feed, and questions incorrectly marked as unanswered
36577
"Questions that may already have your answer" box overlaps onto the footer
4056
Can we clarify to the OP that their question is not yet closed and the duplicates are only suggestions?
13709
Should flagging a question for closure prevent close-voting?
146225
Duplicate questions on other SE sites?
56823
Change how questions marked as duplicates by the asker are represented
133887
Are questions closed as duplicates ever automatically deleted?
133576
Should we reword the closure text for duplicate questions?
64859
Is it acceptable to add a duplicate answer to several questions?
154856
Wording of "possible/exact duplicates" when closing the question
7406
When merging questions, leave the duplicate one as a placeholder
70074
How to handle a deliberate duplicate question
112760
Bug when marking a question as duplicate