把皮膚和組織拉緊
這一組就是核心畫面本身，沒有比喻：真的有東西被拉緊了。形容詞講性質，名詞直接拿這個性質當那樣東西的名字。
adjective · C1
Used about a liquid or cream that makes your skin pull tight and feel less oily, or that makes the flesh around a small cut draw together so it stops bleeding.
有收斂作用的
核心畫面
One picture holds this whole word: something soft being pulled tight and drawn . Put it on skin and the surface tightens and the oil is carried off; put it on a small cut and the flesh closes; take it into your mouth and your cheeks feel dry and shrunken; put it into a sentence and the sentence loses every soft edge it had. The pull is always the same. What changes is only what is being pulled in — skin, tissue, the inside of the mouth, or the padding around what someone says.
這個字底下可以想成同一個動作：把柔軟的東西往內拉緊。擦在皮膚上，表面繃起來、油被帶走；點在小傷口上，組織收合、血就止…更多收起
這個字底下可以想成同一個動作：把柔軟的東西往內拉緊。擦在皮膚上，表面繃起來、油被帶走；點在小傷口上，組織收合、血就止住；放進嘴裡，口腔發乾、像被收縮；放進句子裡，那句話身上所有柔軟的部分都被拉掉了。拉的力道從頭到尾是同一種，變的只是被拉的東西——皮膚、組織、口腔，或是話裡原本的那層緩衝。From the word’s history
Wiktionary gives astringent from Latin adstringere 'to bind fast', made of ad- 'toward' and stringere 'bind, pull tight', and points to stringent from the same root. The modern picture sits right on top of that: everything astringent pulls something in toward itself.
依 Wiktionary，astringent 來自拉丁文 adstringere（綁緊），由 ad-（朝向）加 stringere（拉緊、綁住）組成，同一個字根也長出 stringent（嚴格的）。現代的畫面正好疊在字根上：凡是 astringent 的東西，都在把某樣東西往自己這邊收緊。
Wiktionary 'astringent' etymology, supplied in packet (kaikki:3f6f69a190036ae4:866794924)
Three branches
把嘴巴拉緊
同一個拉緊，只是發生在口腔裡。先是嘴巴被收乾的觸感，再延伸去形容那種又尖又衝、讓人縮一下的味道。
adjective · C1
Used about food or drink that leaves your mouth feeling dry and tight, as if the inside of your cheeks were being pulled together. Strong tea, grape skins and unripe persimmons do this, because of a substance called tannin.
澀的（口感）
把話收得很緊
最後一步是把同一個拉緊用在語言上：一句話裡的鋪陳、暖場、台階都被抽掉，只剩下又乾又緊的那個核心。
adjective · C2
Sharp and severe in what it says, with nothing soft or kind added — used about criticism, remarks, humour, or the tone of a piece of writing or a person.
尖銳而不留情面的