One way to hold this word: a deep bowl on the end of a long handle, pushed down under the surface of water and lifted out again full. The handle exists so your hand stays out of the hot or the deep; the bowl is the part that goes under. Everything the word names keeps a piece of that picture — the tool itself, the small bird that drops under a stream and comes back up, the seven stars drawn as that same bowl-and-handle shape, and the worker or machine arm whose whole job is that one downward dip.
From the word’s history
The word is dip plus the agent ending -er, recorded in Middle English as dippere: the one that dips. That ending does not care what kind of thing it labels, which is why one word can name a tool, a bird and a worker.
Wiktionary 把這個字記成 dip（往下浸）加上 -er（做這件事的那一個），中古英文寫作 dippere。-er 不挑對象，所以工具、鳥、工人都可以共用同一個字，因為牠們做的是同一件事。
Wiktionary, via packet evidence source_ref kaikki:3f6f69a190036ae4:1053203492 — 「From Middle English dippere; equivalent to dip + -er.」
登入就可以看每一支怎麼連回核心畫面。