末席を汚す（まっせきをけがす）

Japanese vocabulary

Meaning: to have the honour of being present (at a meeting, etc.); to have the honour of being a member (of a society, etc.); to soil the lowest seat by one's presence

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “末席を汚す” pronounced in real videos (YouGlish)