chin · noun C /tʃɪn/Full view
B1 the bottom part of a person's face, below their mouth
Dictionary examples:

Fasten the strap beneath your chin.

She sat behind the table, her chin resting in her hands.

Learner example:

I'm just about 20cm taller and I've grown whiskers on my chin, which is quite an uncommon look. (First Certificate in English; B2; Spanish)

Cambridge University Press