One way to hold this word: something is tight without warning, holds for a moment, and then lets go. In a muscle that is a cramp you cannot argue with. Lend the same picture to a feeling and you get fear or guilt you for two seconds and then releasing. Lend it to a crowd and you get a short burst of buying or building. Sudden, strong, short, and not up to you.
spasm 可以想成：某個東西毫無預警被猛地一拉，緊住一下，然後放開。發生在肌肉上，就是你講不了道理的抽筋。把同一張圖借給情緒，就是恐懼或愧疚抓你兩秒又鬆手。借給一群人，就是一陣突然的搶買或趕工。四個字概括它：突然、強烈、短暫、由不得你。
From the word’s history
From Ancient Greek spasmos, from the verb spao, to pull or draw out. The pulling in the old verb is still the pulling you feel in a cramp.
來自古希臘文 σπασμός，而它出自動詞 σπάω，意思是「拉、拽」。古字裡的那個「拉」，就是今天抽筋時感覺到的那一拉。
packet evidence: Wiktionary etymology_text for spasm (Latin spasmus < Ancient Greek σπασμός < σπάω to draw out, pull out)
登入就可以看每一支怎麼連回核心畫面。