echo signal (0 synonym found)

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Definition of echo signal:

°An indication given to another person.
°An on-off light, semaphore, or other device used to give an indication to another person.
°To indicate.
Definition of echo signal:

°An indication given to another person.
°An on-off light, semaphore, or other device used to give an indication to another person.
°To indicate.
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