homing pigeon
US /ˈhoʊmɪŋ ˌpɪdʒɪn/
UK /ˈhoʊmɪŋ ˌpɪdʒɪn/
1.
a pigeon trained to find its way home over long distances, used for carrying messages
:
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The general sent a message by homing pigeon.
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They used homing pigeons during the war to send secret communications.