Here's a breakdown of its origins:
* Historical Use of Oxen: Oxen have been used for agricultural work and transportation for thousands of years. Their strength and endurance were essential for plowing fields, hauling heavy loads, and even powering mills.
* Observational Basis: People directly observed the immense strength of oxen. They witnessed these animals pulling heavy plows through tough soil, hauling carts laden with goods, and even carrying people.
* Metaphorical Extension: The strength of oxen became a natural metaphor for human or other physical strength. It was a simple and effective way to convey the idea of someone or something being incredibly powerful.
* Folklore and Proverbs: The strength of oxen is often featured in folklore and proverbs across many cultures. This further reinforces the idea of oxen as a symbol of physical strength.
In summary: The phrase "strong as an ox" has its roots in the long and practical relationship between humans and oxen. The phrase has evolved from an accurate observation of oxen's strength into a widely recognized idiom for describing exceptional physical power.