Jarana Spanish

de cajón

Short answer

In Lima, "de cajón" means obviously, a given. The register is coloquial — fine among friends, out of place in a job interview or anything written to an institution. The standard Spanish equivalent is "por supuesto, evidentemente". In use: De cajón que va a llover en agosto.

Part of speechlocución adverbial
Registercoloquial
Standard Spanishpor supuesto, evidentemente
In useDe cajón que va a llover en agosto.
Obviously it is going to be grey in August.

Draft entry — needs a native-speaker check before publishing.

Marks something as too predictable to argue about. Handy for softening a strong opinion into a shared assumption.