Mo. Rev. Stat. § 511.110
Current with changes from the 2023 Legislative Session
If the defendant shall fail to file his answer or other pleading within the time prescribed by law or the rules of practice of the court, and serve a copy thereof upon the adverse party, or his attorney, when the same is required, an interlocutory judgment shall be given against him by default.
§ 511.110, RSMo
RSMo 1939 § 1239