Answer:
By jamming a sharpened stake through the cyclops' single eye.
Step-by-step explanation:
The cyclops can't tell the difference between Odysseus and his men and the sheep Polyphemus lets out in the morning, so Odysseus and his men escape.
Hope this helps, have a great day/night!
P.S. you would think that, if you were a blinded cyclops, you would know something was wrong and you would be more careful and aware. LOL.