One way to hold this word: a big broad-winged bird turning slowly in wide circles, high up, beating its wings hardly at all. What is odd about buzzard is that the same name lands on two different birds on the two sides of the Atlantic - a hunter in Britain, a bird waiting for something already dead in America. The shape in the sky is what they share, and once the word moves to a person it is that same image of circling and waiting that comes with it.
From the word’s history
Middle English bosart, from Anglo-Norman buisart and Old French busart, possibly from Latin buteo, a hawk. So the British hunting bird sits closest to the oldest meaning, and the word has no connection to buzz.
中古英文 bosart，來自古法文 busart，源頭可能是拉丁文 būteō（一種鷹）。所以英式那隻會獵食的鵟最接近它最早的意思；另外，這個字跟 buzz（嗡嗡聲）沒有關係。
packet evidence: Wiktionary etymology 1 for 'buzzard' (kaikki:3f6f69a190036ae4:225212204:46149)
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