One target, standing still, and a great many things sent at it from a distance, one after another after another. Nobody walks up close. The things keep arriving, and what makes it bombarding is not the first one but the fact that it does not stop.
From the word’s history
Latin bombus meant a booming, buzzing sound. Middle French bombarde named a medieval siege cannon after the noise it made, and French bombarder meant to fire one. English took both the machine and the action.
拉丁文 bombus 指轟隆、嗡嗡的低沉聲響。中世紀法文的 bombarde 就用這個巨響來命名一種攻城大砲，動詞 bombarder 則是「用它開火」。英文把機器和動作一起借了過來，所以今天名詞 bombard 是那台砲，動詞 bombard 是那個一直打的動作。
Wiktionary (kaikki extract) etymology for bombard noun (etymology 1) and verb (etymology 2), source_ref kaikki:3f6f69a190036ae4:124989313:12796 / :125002109:14237
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