御無沙汰

ごぶさた · gobusata · JLPT N2 · noun

while

📭 御 (honorific) + 無 (none) + 沙汰 (news) = polite way to say 'no news' for a long while

沙汰 means news or word, so 無沙汰 is 'no news'. Adding the honorific 御 makes it polite, used to apologize for not writing or calling in a long time.

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