noun
waiter, head waiter
B1
Ober: masculine noun meaning 'waiter' and 'head waiter/maître'. Use definite article der. Plural often unchanged (die Ober). Declension irregular: genitive singular des Obers; dative plural den Obern. Common in restaurants; more formal or regional than 'Kellner'. Used in German-speaking restaurants and hotels; sometimes used jokingly.
Examples
Der Gast rief den Ober, weil die Rechnung fehlerhaft war.
The guest called the waiter because the bill was incorrect.
Der Ober brachte uns die Speisekarte.
The waiter brought us the menu.
Der Ober des Hauses begrüßte jeden Gast persönlich.
The head waiter welcomed every guest personally.
Details
Mnemonics
Picture a waiter in a jacket with the label 'Ober' on his name tag
Sounds like 'offer' — the waiter offers you the menu
der = imagine a male waiter (der) holding a tray
Notes
Traditional term for a waiter, somewhat formal/old-fashioned in parts of Germany; still common in restaurant contexts.