popręg 用英语:

the girth of somebody's waist

The oak was two metres in girth.

It's a cinch to learn to swim.

For a person who is in good physical condition, climbing mountains is a cinch.

For a stunt professional it would have been a cinch, but Harris had never been on a film shoot before.

Don't worry. Everything is cinched.

The biochemistry test was a cinch.