知道門道，所以不好騙
這一支把「知道」往外用：看得懂場面，出手就準，別人佔不到便宜。
adjective · C1
Clever and careful in a practical way — you can see what is really going on, and you are hard to fool. It is used especially about money, business, and politics.
精明的
核心畫面
One way to hold canny is the person who knows how the thing works. Not the cleverest person in the room, and not the loudest — the one who has seen this before, so nothing surprises them and nothing hurries them. From that one picture the word grows in two directions. Because they know, they are hard to fool, and they make the small careful move at the right moment. And because they know, they are steady to be near, which is why in Scotland and the north-east of England calling someone canny is simply calling them good company.
「canny」可以想成那個「知道門道」的人。他不是全場最聰明的，也不是講話最大聲的。他只是看過了，所以沒有什麼事嚇得…更多收起
「canny」可以想成那個「知道門道」的人。他不是全場最聰明的，也不是講話最大聲的。他只是看過了，所以沒有什麼事嚇得到他，也沒有什麼事催得動他。從這一個畫面，字往兩個方向長。因為他知道，所以他不好騙，而且會在對的時候出一步小而穩的棋。也因為他知道，待在他旁邊會讓人安心——所以在蘇格蘭和英格蘭東北部，說一個人 canny，就等於說他是個讓人舒服的好人。From the word’s history
The supplied source takes canny from Northern English dialect, from can meaning to know, plus -y, and behind that Old English cunnan, to know how to do something. The same root gives cunning. That is the whole word in one line: canny is know-how turned into a description of a person.
packet 附的來源說 canny 來自英格蘭北部方言，由 can（知道、會）加 -y 構成，再往前是古英文 cunnan（知道怎麼做）。同一條線也長出了 cunning。一句話就說完了這個字：canny 就是把「會、懂」變成對一個人的形容。
Wiktionary entry for 'canny' (etymology 1) as supplied in this packet (source_ref kaikki:3f6f69a190036ae4:631664799): 'Northern English dialect, from can (to know) ( + -y), from Middle English can ... from Old English cunnan (to know how to, be able to)'.
Two branches
知道分寸，所以讓人放心
同一個「知道」，往裡收。懂分寸的人不會讓場面難看，待在他旁邊很安穩，於是在某些地方，這個字乾脆就用來說「人很好」。
adjective · C1
Nice, kind and easy to be around. This use belongs to Scotland and the north-east of England, where it can also describe someone or something gentle and steady.
和善的；不錯的