This is the 611th most frequent Vietnamese word.
thùng
"Thùng" means "box" or "container" in English.
In this sentence, 'thùng' refers to a container or a box.
Tôi có một cái thùng rỗng trong nhà.
I have an empty box in the house.
Here, 'thùng' depicts a bucket used for containing water.
Anh ấy đã dùng thùng nước để tưới cây.
He used a bucket of water to water the plants.
In this context, 'thùng' is part of the compound 'thùng thư', meaning mailbox.