This is the 2761st most frequent Catalan word.
caiguin
"Caiguin" is the third-person plural present subjunctive form of "caure," meaning "they fall" or "they may fall."
The word 'caiguin' is used here in its subjunctive form to express an uncertain or desired event - the falling of leaves.
Espero que no caiguin les fulles dels arbres aquest any.
I hope that the leaves of the trees don't fall this year.
Here, 'caiguin' highlights an observational action performed based on the fall of a physical object in the subjunctive mood.
És important que caiguin les sabates per veure si encaixen.
It is important that the shoes fall to see if they fit.
This usage employs 'caiguin' in a hypothetical or cautionary scenario concerning children.