This is the 5402nd most frequent Chinese word.
低落
Low; depressed; downcast.
Here '低落' describes the emotional state of an individual, meaning feeling down or disheartened.
他的情绪最近很低落。
His mood has been low recently.
In this sentence, '低落' is used to describe a sudden drop in temperature, referring to a decrease in value.
气温突然低落时要注意保暖。
You should keep warm when the temperature suddenly drops.
Here '低落' denotes a decline in sales numbers in a business context.