ḿ particle /ŋ́/
Definitions
  1. standard spelling of ń (“imperfect aspect marker”) (used before verbs that start with a /b/ sound)
Other entries with this spelling
Wiktionary records 2 entries spelled “ḿ”. You're reading one of them; here are the others.
Source: Wiktionary · etymology 3, where this word is spelled “m”. Reference: en-m-yo-particle-OoRJFo7v