This is the 222nd most frequent German word.
allen
"Allen" is the dative plural form of "alle," meaning "to all" or "for all."
Here, 'allen' is the dative plural form of 'alle,' used as the indirect object in the sentence.
Ich wünsche allen einen schönen Tag.
I wish everyone a nice day.
In this context, 'allen' refers to 'everyone' in the dative case, often implied when used as a subject affecting the verb.
Allen ist klar, dass sie etwas tun müssen.
Everyone understands that they need to do something.
The word 'allen' is used in the dative plural to indicate the recipients of the action of the verb 'helfen.'