Verb (5-dan, む, transitive)
1.  to thrust (something) into (something);  to cram;  to stuff;  to shove
Verb (5-dan, む, intransitive)
2.  to plunge into;  to charge into;  to rush into;  to ram into;  to crash into
3.  to delve into (a matter);  to go into depth;  to get to the heart (of something)
Verb (5-dan, む, transitive)
4.  to press (someone) about;  to point out (e.g. an inconsistency);  to question sharply;  to grill
5.  to get involved with;  to meddle in;  to poke one's nose into
Verb (5-dan, む, intransitive)
6.  to riposte;  to retort;  to quip