(as) strong as an ox
Possessing great physical strength. (Oxen were traditionally used as work animals.) You should get Bert to help you move all this furniture—he's strong as an ox. If you go to the gym every day, you too will be as strong as an ox.
strong as an ox
If someone is as strong as an ox, they are extremely strong. Big Beppe, as everybody calls him, is enormous for his age and as strong as an ox. Note: You can replace ox with the name of another large animal, for example horse or bull. Despite his age, Tom was as strong as a bull.