join up the dots
join up the dotsadd the missing links in a line of reasoning (and reach the inevitable conclusion).
The expression is based on the idea of an outline drawing made by tracing a line through a series of dots.
2003 Scotland on Sunday The Mercury Music Prize…really helped us to be taken seriously. I think a lot of people knew the songs but didn't necessarily know they were by us so it also helped to join up the dots for them.