Definition of the Forth Bridge noun from the Oxford Advanced Learner's Dictionary

 

the Forth Bridge

 noun
noun
BrE
 
; NAmE
 
 
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Culture The Forth Rail Bridge was built near Edinburgh in 1890 and is considered one of the greatest engineering achievements of its period. Most British people know the story that it is always being painted, because when the painters have finished painting it from one end to the other, it is necessary to start at the beginning again. There is also a road bridge that was built beside the Forth Rail Bridge in 1964. It is a suspension bridge (= a bridge hanging from cables supported by towers at each end) and one of the longest of its kind in the world.Idioms
like painting the Forth Bridge
 
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(British English) used to describe a job that never seems to end because by the time you get to the end you have to start at the beginning again Tidying up after the children is like painting the Forth Bridge. From the name of a very large bridge over the River Forth in Scotland.