This is the 12502nd most frequent Spanish word.
mentón
Chin.
Here, 'mentón' refers explicitly to the anatomical part of the body, the chin.
El boxeador recibió un golpe en el mentón durante la pelea.
The boxer received a punch on the chin during the fight.
In this sentence, 'mentón' is used to illustrate a gesture related to thought or introspection.
Ella siempre toca su mentón cuando está pensando profundamente.
She always touches her chin when she is thinking deeply.
In this instance, 'mentón' serves to describe a facial characteristic, emphasizing the prominence of the chin.