This is the 8564th most frequent Portuguese word.
acabarem
"Acabarem" means "to finish" or "to end" (in the subjunctive or future form for "they/you all" in Portuguese).
In this sentence, 'acabarem' is used as the infinitive form of 'acabar' preceded by 'não' to indicate failure to complete an action.
Eles pediram desculpas por não acabarem o trabalho mais cedo.
They apologized for not finishing the work earlier.
Here, 'acabarem' is in the subjunctive present form, expressing necessity or a condition for completing tasks.
É importante que todos acabarem as suas tarefas antes de sair.
It is important that everyone finishes their tasks before leaving.
In this usage, 'acabarem' is in the future subjunctive form, implying a potential or probable completion of an action dependent on time.