99% of people get this idiom wrong

This idiom is used to describe the situation of a person who is doing a job alone, without anyone to help or support. Surely many people have used this idiom, but are you using it correctly?

Which is the correct idiom?

In your opinion, is the answer “Single-handed” or “Single-handed” correct? Please write it in the comment box below so everyone can know.

Trung Temple

Source: https://vtc.vn/99-nguoi-dung-sai-cau-thanh-ngu-nay-ar836097.html