This is the 3803rd most frequent Catalan word.
arribin
"Arribin" is the third-person plural present subjunctive form of "arribar," meaning "they arrive" or "may they arrive."
In this sentence, 'arribin' is the third-person plural subjunctive present form of the verb 'arribar', used here to indicate a wish or hope.
Espero que arribin aviat.
I hope they arrive soon.
In this context, 'arribin' expresses an action in the future subjunctive, contingent upon another event happening.
Quan arribin, digues-los que ens truquin.
When they arrive, tell them to call us.
Here, 'arribin' conveys a necessity within an expressed opinion or advice, again using the subjunctive mood.