what does "at someone's expense" mean?

[Squidwardmaxx]

i m fearful

 

[Panzram]

i m fearful

How do you not know that? It is pretty self explanatory.

 

[Spamorzz]

i m fearful

Nigga ask gpt fym

 

[superpsycho]

at the expense of someone as in throwing them under the bus

 

[Squidwardmaxx]

at the expense of someone as in throwing them under the bus

 

[Squidwardmaxx]

throwing them under the bus

thats really heateful