What does 赔着 mean in this sentence? 赔： compensate, pay for

I can't really get '赔着笑脸' Maybe 'it cost him his smile to leave' i.e. he was sad to leave??? 

Or is there some other meaning in 赔？

八戒偷眼一看，那三个女儿美如天仙，不由得想入非非，赔着笑脸走了过去。
賠
(1)compensate; indemnify
(2) apologize

賠笑 = smile apologetically
[赔着]笑脸 = [serve up] a smiling face (apologetically)
八戒 had naughty thoughts about the three girls. His subconscious guilty feeling was showing on his face with an apologetic smile