/ë/ is inserted as a transition sound between /k/ and /m/.
The /ë/ of the root is rounded to /u/ following /m/.
/w/ is elided in final position after a vowel, and /wa/ is realized as /o/.
Note: The verb applies to eating food derived from animate objects and thus is treated as a transitive animate verb. Some speakers would prefer /hàch/ to /hèch/ as the question particle.