noun
test of strength
A contest or trial to see who is stronger, often physical but can be used figuratively.
腕相撲で力合わせをしよう。
Let's have a test of strength with arm wrestling.
二人は力合わせをして、どちらが重いものを持ち上げられるか競
The two had a test of strength, competing to see who could lift heavier things.