you'd complain if you were hung with a new rope

ユーモラス文体

(humorous) Said as a mild admonishment to somebody who is always complaining.

日本語の意味

皮肉を込めた軽い叱責で、いつも不平不満ばかり言う人に対して、『どんな新しい状況でも文句を言う』という性格を指摘する意味です。

Honestly, you'd complain if you were hung with a new rope, so I won't bother trying to please you.

正直言って、新品の縄で吊るされても文句を言うだろうから、あなたを喜ばせようとはしないよ。

意味（1）

(humorous) Said as a mild admonishment to somebody who is always complaining.