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I heard from my Japanese friends that I should avoid using the word 「来日」 when
I'm outside of Japan.

Is it true, and, if it is, has this something to do with the kanji 「来」?
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2017-04-18T01:25:37.360
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question
word-choice
Should I avoid using the word 「来日」 when referring to myself?
The word 「来日{らいにち}」 means visiting Japan. The kanji 「日」 in that word is an
abbreviation of 「日本{にほん}」 (Japan). The kanji 「来」 can be used to express coming
somewhere, but I don't think there is a generally understood abbreviation
method for every country.

One way to express arriving in a country:

> [country]に到着{とうちゃく}する (ni tōchaku suru)
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2017-04-18T01:43:33.820
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answer
Yes, it is true. 「来」 means _to come_.  
If you are outside of Japan, you can use 「[訪日]{ほうにち}」 instead.  
「訪」 means _to visit_.
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2017-04-18T01:48:58.983
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2017-04-18T06:53:00.330
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answer