1.
If you piece together the truth about something, you gradually discover it.
They’ve pieced together his movements for the last few days before his death...
In the following days, Francis was able to piece together what had happened...
Frank was beginning to piece things together.
PHRASAL VERB : V P n (not pron) , V P wh , V n P
2.
If you piece something together , you gradually make it by joining several things or parts together.
This process is akin to piecing together a jigsaw puzzle...
PHRASAL VERB : V P n (not pron)