This is the 4628th most frequent Spanish word.
caiga
"Caiga" is the present subjunctive form of "caer," meaning "falls" or "may fall."
The word 'caiga' here represents the subjunctive form of the verb 'caer', used to express a hypothetical situation or wish.
Espero que no se caiga.
I hope it doesn't fall.
In this sentence, 'caiga' expresses a future action using the subjunctive mood after the temporal conjunction 'cuando'.
Cuando caiga la noche, encenderemos las luces.
When the night falls, we will turn on the lights.
The usage of 'caiga' here reflects a possibility or doubt, again using the subjunctive mood of the verb 'caer'.