我说完“祝你生日快乐”以后，对方说“mercy”是什么意思啊

对你表示感谢吧,意思是我很荣幸.

mercy

n.
1. 慈悲,怜悯;仁慈,宽容[U][(+on)]
The commander showed mercy to the prisoners of war.
司令官对战俘十分怜悯。
2. 仁慈行为,善行[C][(+for)]
3. 【口】幸运,侥幸[S]
It was a mercy that the whole family survived the earthquake.
这次地震中一家人都幸免于难,真是不幸中之大幸。
4. 救济,救难
Distributing food among the homeless was an act of mercy.
发配食物给无家可归的人是救苦救难的行为。

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我觉得。。人家说的是merci
法语里面谢谢的意思
= =

完整的是不是应该是It's very mercy of you?