Cheer up = lighten up
Cheers = thanks = ta
Cheers is an informal way of saying thanks in British English (less common in American English).
For example, "cheers, mate" = "thanks, my friend"
Cheers can also be used when drinking.
For example, at Christmas dinner people would raise their glasses and say "Cheers!" and then drink up their wine or beer.
2005-12-05 15:17:57 補充：
Yes American English is more prevalent in Taiwan because the USA is a much bigger country and there are much more Americans than British. Also, Taiwanese tend to be quite pro-American.
2005-12-18 17:19:32 補充：
If you say someone is pro-American, you mean he/she likes American things, such as people, food, or anything; and he/she will think it is great as long as it is from America.
my pretty little head