ˌForth ˈBridge, the BrE AmE
a famous metal railway bridge built in 1889 over the River Forth in Scotland, which is considered to be a fine example of 19th century engineering. People sometimes say that a job is ‘like painting the Forth Bridge’ when they mean that it seems to never end, because the metal bridge takes a long time to paint, and when the job is finished it has to start again.