Definition of signboard noun from the Oxford Advanced Learner's Dictionary

 

signboard

 noun
noun
BrE BrE//ˈsaɪnbɔːd//
 
; NAmE NAmE//ˈsaɪnbɔːrd//
 
 
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a piece of wood that has some information on it, such as a name, and is displayed outside a shop/store, hotel, etc.
See the Oxford Advanced American Dictionary entry: signboard