铁板一块

tiěbǎnyīkuài

铁板一块 — tiěbǎnyīkuài

1. lit. an iron plate in one piece; fig. firm, unyielding, cast-iron; tightly unified or indisputable

   这家公司内部管理铁板一块，外人很难介入。 zhèjiā gōngsī nèibùguǎnlǐ tiěbǎnyīkuài wàirén hěn nán jièrù — The company's internal management is cast-iron and unified; outsiders find it hard to get involved.