Emily Dickinson Lexicon

must, v. [OE; modal auxiliary verb of need, obligation, responsibility, requirement, demand, conclusion, or likelihood.]

1. Should; ought.
2. Has to; is very probably; by every indication; have a high likelihood to.
3. Should; ought to; be obligated to; have a responsibility to.
4. Be unable to escape the reality.
5. Have to; be required to.
6. Phrase. “There must be”: it is very probable that exist; it is highly likely that there be.