This is the 699th most frequent German word.
schloss
"Schloss" means "castle" or "palace" in English.
Here, 'Schloss' is used as a noun meaning 'castle', referring to a large and stately building.
Das Schloss ist ein wunderschönes Gebäude.
The castle is a beautiful building.
Here, 'Schloss' refers to a 'lock', a device used for securing something.
Das Schloss am Fahrrad war gebrochen.
The lock on the bicycle was broken.
In this context, 'schloss' is the past tense form of the verb 'schließen', meaning 'closed'.