entries → 內行
TSUMUGU · TOCFL B2 (est.) · 詞
內行 word · TOCFL B2 (est.)
內行 ＝ 內 ＋ 行
ㄋㄟˋ ㄏㄤˊ · nèiháng
adjective — expert, knowing the ropes; noun — an insider, someone skilled in a trade

字源 FORM — what the parts do

內inside, within (內部)nèi
行a trade, line of work (行業)hángread háng here (a profession), not xíng (to walk)
內行，內部的內，行業的行。

故事 STORY — a scene to remember it by

他在這一行（行）的裡頭（內），門道全懂。
He stands inside (內) the trade (行) — he knows all its tricks.
記憶法
關 · Related
外行wàihánga layman — the outsider to the trade, the paired 外行業hángyèan industry, trade — the 行 one is inside of