What is the Meaning of the Expression
to NOT BELIEVE one’s EYES (or EARS)?

This expression can take several forms, such as:

I DON’T BELIEVE MY EYES (or EARS)

I CAN’T BELIEVE MY EYES (or EARS)

I COULDN’T BELIEVE MY EYES (or EARS)

Note:  When you change the subject, remember to change the possessive adjective to match.

He couldn’t believe his eyes. / She couldn’t believe her ears.

Definition:

to be amazed, or shocked, by what you see

This can be used for either positive or a negative experiences.

Example:

Dave couldn’t believe his eyes.  He was witnessing a robbery.

 

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