This is the 346th most frequent German word.
müsse
"Müsse" is an outdated or poetic subjunctive form of "müssen," meaning "must" or "to have to."
In this sentence, 'müsse' represents the 1st person singular subjunctive I form of the verb 'müssen', usually employed in indirect speech or to express a hypothetical need or obligation.
Ich müsse heute für die Prüfung lernen.
I should study for the exam today.
Here, 'müsse' is used in the 3rd person singular subjunctive I, reflecting a reported speech scenario to indicate obligation or requirement as relayed by someone else.
Er sagte, sie müsse pünktlich sein.
He said that she must be punctual.
This sentence utilizes 'müsse' in a hypothetical expression to emphasize the speculative obligation or requirement if another thought process were considered.