蹈常袭故dǎo cháng xí gù

墨守成规，沿用旧法。指照老规矩办事。

例后之君子，蹈常而袭故，惴惴焉惧不免于天下。——宋·苏轼《伊尹论》

英go on in the same old way; be a slave to old methods of doing things; follow the conventional tradition;