那條會收緊的繩子
核心畫面裡的工具本身，其他用法都從這裡長出來。
noun · B2
A long rope with a loop at one end that slides tight when it is pulled, thrown over the head of a cow or horse to catch the animal. It is most closely linked with ranch work in the western United States.
套索
核心畫面
You can picture a loop of rope flying out, dropping over something, and shutting tight as the rope is pulled. That one movement holds the whole word: the thing that does it, the act of doing it, and the circle you draw on a screen to catch a shape the same way.
可以想成一個動作：一個繩圈甩出去，落下來罩住東西，然後一拉就收緊。這個字的每一層都在這個動作裡。一層是那條會收緊的繩…更多收起
可以想成一個動作：一個繩圈甩出去，落下來罩住東西，然後一拉就收緊。這個字的每一層都在這個動作裡。一層是那條會收緊的繩子本身。一層是把它甩出去套住的動作。還有一層搬到了螢幕上——滑鼠畫的那一圈，把不規則的圖形圈起來抓住，用的是同一個畫面。From the word’s history
English took lasso from Spanish lazo, which goes back to Latin laqueus, a noose or snare. It is a doublet of lace, and the shared picture is a cord formed into a loop.
英文的 lasso 來自西班牙文 lazo，再往上是拉丁文 laqueus「圈套、活結」。它跟英文的 lace（繩帶）同源。可以想成：兩個字共同的畫面，就是一條繞成圈的繩。
Wiktionary entry for lasso (Spanish lazo < Latin laqueus; doublet of lace), packet evidence source_ref kaikki:3f6f69a190036ae4:810413068
Three branches
甩出去套住的動作
把工具變成動作：整串甩、拋、罩下、拉緊，濃縮成一個動詞。
verb · B2
To catch an animal by throwing a lasso over it and pulling the loop tight.
用套索套住
螢幕上的那一圈
同一個動作搬進軟體：畫一圈，圈裡的東西就被抓住了。
noun · B2
In photo or drawing software: a tool that lets you select a shape with uneven edges by drawing a loose line around it, and the outline that this makes.
套索工具