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Pronunciation varies by accent · noun
(nautical, military) A buoy that sends a radio signal when it detects the sound of underwater objects (such as submarines)..
Use sonobuoy when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sonobuoy means (nautical, military) A buoy that sends a radio signal when it detects the sound of underwater objects (such as submarines)..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use sonobuoy where its definition matches the intended context.
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