This is the 444th most frequent Chinese word.
死
"死" means "to die" or "death" in English.
The word "死" is used to describe the state of being dead.
那只植物已经死了。
That plant has already died.
The word "死" is used to emphasize an extreme degree of tiredness.
他累得要死。
He is extremely tired.
The word "死" is used to stress an extreme level of fear.