看得見的那層灰
核心畫面最直接的落點：髒就在表面上。
adjective · B2
Fairly dirty in an ordinary, everyday way: marked with dust, food or old finger marks and needing a wash, but not disgusting.
髒髒的
核心畫面
One way to hold grubby: a thin layer you cannot name. Not mud, not a stain you could point at — just a dull film left by hands, dust and time, the sort that makes you want to wash before you touch anything else.
「grubby」可以想成附在東西表面的一層說不上名字的灰。不是泥巴，也不是某一塊你指得出來的污漬，就是手、灰塵和時間…更多收起
「grubby」可以想成附在東西表面的一層說不上名字的灰。不是泥巴，也不是某一塊你指得出來的污漬，就是手、灰塵和時間留下來的一層黯淡。看到它，你會想先去洗個手再碰別的東西。這個字的幾個用法，都像從這層灰長出來：有時候是真的在衣服上，有時候搬到了行為上，有時候則是最老實的字面——裡面真的有蟲。From the word’s history
Wiktionary derives grubby from grub plus -y. A grub is an insect larva, the soft thing turned up in soil, and grub is also the digging itself. The word therefore starts close to earth and larvae, which fits the film-of-dirt picture the adjective still carries.
依證據，grubby 來自 grub 加上 -y。grub 是土裡的幼蟲，也指「翻土、挖」這個動作；-y 表示「帶著…的」。所以這個字從一開始就離泥土和蟲很近，跟形容詞今天那層「灰灰的髒」相當合得來。
Wiktionary 'grubby' etymology_text supplied in this evidence packet (source_ref kaikki:3f6f69a190036ae4:1232031366:14231)
Four branches
搬到行為上的那層灰
同樣一層灰，只是這次沾在事情和人的做法上，洗不掉。
adjective · C1
Used about behaviour, money or dealings that feel low and dishonest: small, mean and not quite clean, the kind of thing people would rather not have looked at closely.
見不得人的
拿那層灰去擋一隻手
這一支不是在描述髒，而是把「髒」當成工具，用來表達不想被碰。
adjective · C1
Used in 'keep your grubby hands off' and 'get your grubby hands (or paws, or mitts) on something' to complain that someone is touching something, or getting hold of it, when you do not want them to.
那隻不該伸過來的手
裡面真的有蟲
這一支不走比喻，直接用 grub 的字面意思。跟其他幾支共用同一個字根，但走的是「幼蟲」那條路，不是「表面那層灰」。
adjective · C2
Of a crop, a fruit or a farm animal: having grubs in it — grubs being the small soft young form of certain insects — so that it is damaged and worth less.
生蟲的