被當成沒在出力的人
把「沒力氣」從一天延長成一生，再加上責備，就成了這一支。
noun · B2
An insulting word for someone who does not work, has no plans for their life, and lives on help from other people.
混日子的人（貶）
核心畫面
You can think of deadbeat as something beaten flat, with nothing left in it. That picture starts with a body after a long day — no energy, no push. From there it moves onto people who never seem to push at all, and onto money that never arrives. The same two words even work on a machine, where the swinging is beaten out of a needle so it stops dead.
deadbeat 可以想成被打趴了、裡面什麼都不剩的樣子。這個畫面最早是身體上的：忙了一整天，一點力氣都沒有。從那裡…更多收起
deadbeat 可以想成被打趴了、裡面什麼都不剩的樣子。這個畫面最早是身體上的：忙了一整天，一點力氣都沒有。從那裡再走出去，就變成講一個人好像從來不出力，也變成講一筆永遠不會到的錢。同樣兩個字放到機器上也成立：指針的擺動被壓掉，所以它一下就停死。From the word’s history
The packet's Wiktionary entry says the word is dead + beat, that the adjective for an exhausted person appears around the 1820s, and that during the American Civil War, around 1863, it also became a derogatory word for someone who defaults on debts or dodges responsibility. So the tired sense is first and the insult grows out of it.
packet 附的維基詞典寫：這個字是 dead 加 beat。形容人筋疲力盡的用法約在一八二零年代出現；到了美國內戰期間，大約一八六三年，它又變成罵人的字，指欠債不還、逃避責任的人。所以「累垮」是先來的，罵人的意思是從它長出去的。
Wiktionary entry supplied in packet (source_ref kaikki:3f6f69a190036ae4:1012694237:11184): From dead + beat; exhausted sense c. 1820s, debt-defaulting sense c. 1863.
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