What does «empollar» mean in Spanish?

Heat the eggs to hatch the chicks. Incubate the eggs.

Examples of use in Spanish: "La gallina empolla los huevos".
To meditate deeply on a matter.

Examples of use in Spanish: "Estoy empollando la idea".
To study a lot. It is used especially when something is memorized. It is also used in a derogatory sense. Ú. t. c. pr.

Examples of use in Spanish: "empollarse una lección".

"Empollar para un examen".
Producing bees their brood.
Breeding blister.
(de la palabra empolla) Blistering of the skin.