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Definition of smoke signal noun from the Oxford Advanced Learner's Dictionary

smoke signal

noun
 
/ˈsməʊk sɪɡnəl/
 
/ˈsməʊk sɪɡnəl/
[usually plural]
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  1. a signal that is sent to somebody who is far away, using smoke
  2. a sign of what somebody is thinking or doing
See smoke signal in the Oxford Advanced American Dictionary
trait
noun
 
 
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