When you meet someone in the evening, say "Добър вечер!"
. Fun fact: "вечер"
is feminine, yet the greeting keeps the old form "добър"
. Children hear "Лека нощ, сладки сънища!"
(good night, sweet dreams). In the morning, "Добро утро!"
works until about 10–11 o'clock.
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Good evening or good night?
"Лека нощ"
(literally "light night") is only for saying goodbye late in the evening or before bed — never as a greeting.

History of Bulgaria
An illustrated history of Bulgaria
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Chestito! — congratulations
"Честито!"
is the all-purpose "congratulations!"

Exactly!
When you fully agree, say "Точно така!"
(exactly!) or "Така е"
(that's true).

Bate and kaka
"Бате"
originally means "big brother", but it's also a friendly way to address any man a bit older than you — a taxi driver, a neighbour, a stranger in the street: "Бате, къде е спирката?"
(mate, where's the stop?).