This is the 9902nd most frequent Catalan word.
mori
The Catalan word "mori" is the subjunctive form of "morir," meaning "may [he/she/it] die" or "let [him/her/it] die."
In this sentence, 'mori' is used in the subjunctive mood to express a wish or desire, indicating that 'mori' (to die) is what is hoped to be avoided.
Que no mori l'esperança en nosaltres.
May hope not die within us.
Here, 'mori' is used in the conditional tense to present a hypothetical situation where the event 'mori' (dies) might occur.
Si mori abans que arribi l'ajuda, serà massa tard.
If he/she/it dies before help arrives, it will be too late.
The use of 'mori' here is in the imperative mood, expressing a strong wish or command for 'mori' (die) to occur to injustice.