盡忠報國 is a proverb that is the tattoo worn on the back of Yue Fei, a famous Chinese warrior who lived until 1142 A.D.

The tattoo can be translated as “Serve the country with the utmost loyalty.” More literally, it means “[The] Ultimate Loyalty [is too] Duty [of] Country.”

Legend has it that this tattoo once saved his life when he was accused of treason.

The first two characters have come to create a word that means “serve the country faithfully” or “die for the country.” Note: It's more a willingness to die for one's country than the actual act of dying.

The last two characters have come to mean “Dedicate oneself to the service of one's country.”

Both of these words are probably only in the Chinese lexicon because of this famous tattoo.

If you break it down, character-by-character, here is what you get:
1. To the utmost, to the limit of something, the ultimate.
2. Loyalty or duty (a sense of duty to one's master, lord, country, or job).
3. Report, recompense, give back to (in this case, you are giving yourself to your country as payback).
4. Country, state, nation, kingdom.

More about the famous warrior and army general, Yue Fei

忠誠 is the written form of loyalty that is universal in Chinese, Japanese Kanji, and old Korean Hanja.

Loyalty is staying true to someone. It is standing up for something you believe in without wavering. It is being faithful to your family, country, school, friends, or ideals when the going gets tough and when things are good. With loyalty, you build relationships that last forever.

Notes:

1. There is also a Japanese version that is part of the Bushido Code which may be more desirable depending on whether your intended audience is Japanese or Chinese.

2. This version of loyalty is sometimes translated as devotion, sincerity, fidelity, or allegiance.

See Also:  Honor | Trust | Integrity | Sincerity

忠義 is another form of loyalty or devotion.

In Chinese, this is more specifically about being loyal and devoted to your friends.

In Japanese, this is more often used to mean loyalty to your country or nation.

Except for the slight difference noted above between Japanese and Chinese, this word is understood universally in Chinese, Japanese Kanji, and old Korean Hanja. It can also be used to describe devotion or fidelity.

It should be noted that this Kanji combination is being used less and less in modern Japan (this is a better choice if your audience is Chinese, though any Japanese person will clearly understand it).