踏襲 (とうしゅう) uses the on'yomi readings: 踏 (とう) meaning "step" and 襲 (しゅう) meaning "succeed" or "follow." Incorrect readings like どうしゅう apply incorrect rendaku or とうじゅう misread 襲. It means to "follow," "adhere to," or "trace," continuing in the same way as before.

踏襲 (とうしゅう) は、「踏 (とう)」と「襲 (しゅう)」の音読みです。「どうしゅう」は誤った連濁、「とうじゅう」は「襲」の読み間違いです。以前のやり方や方針を「そのまま受け継ぐ」「続ける」という意味です。