嚐的人
-er 落在人身上。這是最直接的一支：有人把那一口喝下去，然後做出判斷。
noun · B2
Someone whose job is to taste food or drink — tea, coffee, cheese and so on — in order to judge how good it is and decide whether it is ready to be sold.
品評師
核心畫面
One way to picture taster: one mouthful, taken before the rest. Around that single mouthful stand three things — the person who takes it and judges, the little cup or spoon it sits in, and the small portion handed to you so you can decide whether you want the whole. Taste plus -er lets the word land on any of the three, and the sentence around it tells you which one is meant.
taster 可以想成一幅畫面：在整份之前的那一口。圍著這一口有三樣東西——嚐它並且做判斷的人、裝著它的小杯或小匙，…更多收起
taster 可以想成一幅畫面：在整份之前的那一口。圍著這一口有三樣東西——嚐它並且做判斷的人、裝著它的小杯或小匙，還有別人先給你的那一小份，讓你決定要不要整份。taste 加上 -er 之後，這個字可以落在三者的任何一個上面，句子的其他部分會告訴你是哪一個。From the word’s history
The supplied source records taster as coming from Middle English taster, equivalent to taste plus the ending -er. That ending can attach to a person or to a thing, which is why the same word covers the one who tastes and the cup the taste is poured into.
來源資料記的是：taster 來自中古英文 taster，相當於 taste 加上字尾 -er。這個字尾可以落在人身上，也可以落在東西上。所以同一個字既能指嚐的人，也能指盛那一口用的小杯，這一點在組字的方式裡就已經留好了空間。
Wiktionary entry supplied in the evidence packet (source_ref kaikki:3f6f69a190036ae4:625401569)
Two branches
那一小份，以及裝它的小杯
-er 落在東西上。這一支不看人，只看那一口本身：它裝在哪裡，以及它被拿來做什麼用。
noun · B2
A small cup, glass or spoon used for tasting something, holding just enough for one mouthful; also the little serving in it.
試吃匙；試飲小杯