てっそく

[鉄則] (hard-and-)fast rule

【C】.

鉄則
ironclad regulation
inviolable rule

* * *

てっそく【鉄則】

(hard-and-)fast rule

〖C〗.

* * *

てっそく【鉄則】

an ironbound [ironclad] rule; a hard and fast rule; an invariable principle.

●働かざるもの食うべからずが人の世の鉄則だ. No work, no pay is the rule in this world.