tiritar
tee-ree-tahr

to shiver

1.  ¿Estás segura de que no quieres entrar de vuelta a la casa? Estás tiritando.

Are you sure you don't want to go back inside? You're shivering.

2.  Era una noche helada, y el marinero en la cofa de vigía tiritaba de frío.

It was a freezing night, and the sailor in the crow's nest was shivering with cold.