1. to fall out, to come off, to come out (intransitive)

2. to lose (weight, hair, etc.) (intransitive)

3. to get off, to slip out (intransitive)

4. to skip (attendance), to drop out (of an appointment, meeting, etc.) (intransitive or transitive, intransitive, transitive)

5. to be lacking, to be missing, to be omitted (intransitive)

6. to fall into (especially of water), to sink (intransitive)

7. to get into (a situation) (intransitive)

8. to lapse or sink into a state (e.g. love, drunkenness) (figuratively, intransitive)

9. to wallow in...; to indulge in (thinking) (figuratively, intransitive)

10. to be addicted to, to be hooked to/on (figuratively, intransitive)

11. to be severe; Usually with the implication of displeasure or disapproval (auxiliary, after the infinitive, intransitive)