Final answer:
The underlined word 'creer' in the sentence 'No puedo creer eso' means 'to believe.'
Step-by-step explanation:
In the sentence 'No puedo creer eso,' the underlined word 'creer' means 'to believe.' In Spanish, 'creer' is a verb that expresses the action of having a belief or trusting in something. For example, you can use 'creer' to say 'I believe in you' which translates to 'Creo en ti.'
Learn more about Meaning of the word 'creer' in Spanish