How can I say "away at lunch" (e.g. on a sign)?

I thought I might be able to just write 「昼食中」 - is that correct?
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expressions phrases
How can I say "away at lunch" (e.g. on a sign)?
If you wanted specifically to say you're away on lunch, you could say **"
食事中"**, but that sign is not very common, even if it literally translates to
"during eating."

If what you wanted is a way to write a sign to put on your desk for your
coworkers to see while you're away, a good way to say it is **" 退席中"**, which
literally means "leaving (your) seat for now," and is a pretty common phrase
for a short absence such as having lunch.
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