Manhattan Bridge was the last of the three suspension bridges built across the lower East River, following the Brooklyn Bridge.
When you cross from Manhattan to Brooklyn
you meet Flatbush Ave which goes South across Brooklyn.
Connecting Lower Manhattan (at Canal Street / China Town) with Brooklyn (at Flatbush Ave Extension) OR Downtown Brooklyn following Barkley Center.
Brooklyn side of the bridge today called
Down
Under
the Manhattan
Bridge
Overpass
is acronym of DUMBO.