Definition of blind alley noun from the Oxford Advanced Learner's Dictionary


blind alley

BrE BrE//ˌblaɪnd ˈæli//
; NAmE NAmE//ˌblaɪnd ˈæli//
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a way of doing something that seems useful at first, but does not produce useful results, like following a path that suddenly stops Progress in science cannot be made without exploring blind alleys.
See the Oxford Advanced American Dictionary entry: blind alley