This is the 234th most frequent Spanish word.
deben
"Must" or "should" (third-person plural form of "deber").
Here, 'deben' is used to express obligation or necessity, indicating what someone ought to do.
Ellos deben trabajar más para mejorar.
They must work harder to improve.
In this example, 'deben' is used to denote requirement or necessity for the action to be completed.
Esos documentos deben ser firmados por el gerente.
Those documents must be signed by the manager.
In this sentence, 'deben' conveys a suggestion or recommendation based on appropriateness.