What do they usually write on the sign in public places to inform the visitor that the service is temporarily paused for the lunchtime? "Lunch", "Break", "Out to lunch"?
(Can you, please, specify which English-speaking country you mean?)
Word Usage – ‘Lunch’, ‘Break’, ‘Out to Lunch’?
word-usage
Best Answer
In informal conversation, it's common to say "I'll be out for lunch from 12 to 1" or "We break for lunch at 11".
A sign might say "out to lunch", but I think this is rare today. It's considered too informal. Usually a sign will give the hours, like "Open 9:00am-1:00pm, 2:00pm-6:00pm". The idea that the time from 1:00 to 2:00 (in this example) is a lunch break is usually not stated but simply implied by the gap.
A sign wouldn't normally just say "lunch", as that would not be clear whether it meant that the place is closed for lunch, or that they are serving lunch, or just what they are doing about lunch.