This is the 15340th most frequent Russian word.
потолком
"Потолком" means "ceiling" (in the instrumental case) in English.
Used as a noun to denote the architectural element 'ceiling'.
Моя комната украшена потолком с красивыми узорами.
My room is decorated with a ceiling featuring beautiful patterns.
Metaphorically implies a limit or boundary.
Успех является потолком для наших достижений, если мы не стремимся к большему.
Success is the ceiling for our achievements if we do not strive for more.
Again refers to the architectural 'ceiling', particularly denoting its height.