boon companion

noun
🔊/ˌbuːn kəmˈpænjən/
🔊/ˌbuːn kəmˈpænjən/
(literary)
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  1. a very good friend密友
    Word Originmid 16th cent.: boon from Old French bon, from Latin bonus ‘good’. The early literal sense was ‘good fellow’, originally denoting a drinking companion.