strength of ten people; great strength
Used figuratively to describe someone who is exceptionally strong or capable, as if they had the power of ten ordinary people. Often appears in expressions like 十人力の働き.
With the strength of ten, he finished the construction work all by himself.
Compound of 十 (ten), 人 (person), and 力 (strength). The exact historical derivation is uncertain, but the word is conventionally associated with the idea of having the combined power of ten individuals.