fast company

uncountable

Companions of either gender who do morally questionable things.

Japanese Meaning

道徳的に問題のある行動をする男女の仲間

After he started keeping fast company, his reputation in the town quickly fell apart.

彼が悪い仲間と付き合い始めてから、町での評判はすぐに落ちた。

Sense（1）

Companions of either gender who do morally questionable things.

After James fell in with fast company he started doing drugs and sleeping around.