This is the 1404th most frequent Spanish word.
cumplan
"Cumplan" is the third-person plural present subjunctive form of the verb "cumplir," meaning "they fulfill" or "they comply."
Here, 'cumplan' is used in the subjunctive mood to express a wish or hope.
Espero que ellos cumplan sus sueños.
I hope they achieve their dreams.
In this sentence, 'cumplan' is expressing obligation in a formal instruction using the subjunctive mood.
Es necesario que cumplan con sus responsabilidades.
It is necessary that they fulfill their responsibilities.
The word 'cumplan' here indicates skepticism about completing the task, again employing the subjunctive mood due to doubt.