You can picture someone pushing forward through a crowd and never stopping: quick on their feet, quick with their mouth, always moving toward the next chance. Where that push goes is what changes from sense to sense. Point it at work and people admire it. Point it at your wallet and it is a crime.
From the word’s history
From the verb hustle plus -er: the one who hustles. The source records the plainest reading of the noun as one who rushes or hurries, which is the picture the other senses grow out of.
hustler 是 hustle 加上 -er，字面就是「做 hustle 的人」。來源裡最素樸的一條解釋是「一個急著趕、動個不停的人」，其他幾個意思都可以想成從這個畫面長出來的。
Wiktionary entry for hustler (local kaikki extract, source_ref kaikki:3f6f69a190036ae4:1168701561): From hustle + -er; sense 0 glossed as one who rushes or hurries; an energetic person.
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