圣诞节快乐的英文：
Merry Christmas
Merry X'mas
Merry Xmas

参考例句：

Happy Christmas!
祝你圣诞节快乐!

merry是什么意思：
adj. 快乐的，愉快的，嬉戏作乐的

A merry heart has a continual feast.
一颗愉快的心会享受到接连不断的节日。

Merry is he that has nought to lose
人无所失,不亦乐乎

It is good to be merry at meal
席间心情愉快是为上策

christmas是什么意思：
n. 圣诞节

Christmas was approaching.
圣诞节快到了。

Christmas is an important feast for Christians.
圣诞节是基督徒的重要节日。

Will you be at home over Christmas?
你圣诞节期间在家吗?

xmas是什么意思：
n.圣诞节