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piece (something) together
1. Literally, to fit the pieces of something together into a whole. She got some super glue and pieced the broken lamp back together.
2. To make sense of something by analyzing multiple pieces of information and drawing a conclusion based on what they collectively indicate. Federal investigators are experts at piecing evidence together to track down criminals. At first I was confused by all the strange ways Janet was behaving, but then I pieced it together and realized what she's been up to.
piece something together
to fit something together; to assemble the pieces of something, such as a puzzle or something puzzling, and make sense of it. The police were unable to piece the story together. The detective tried to piece together the events leading up to the crime.
Join or combine parts into a whole, as in With information from several observers, she pieced together an account of what had actually taken place . [Late 1500s]
To join or unite the pieces of something: We pieced the broken vase together. The detective pieced together the sequence of events leading up to the accident by interviewing witnesses.