Readings & Meanings:
おそ（れる） to fear
fear, anxiety, fearful, fierce, awful
I had a terrible dream.
The earth during the time of the dinosaurs had a higher atmospheric temperature than present today.
His face was frozen in fear.
Another 心, which ties into the emotional meaning of this kanji.
In the BC years, this kanji was related to 巩, which means firm, strong. It shows a kneeling person connecting two things with a pipe. This became the basis for the top element of 恐.
So, when your heart feels punctured (i.e. by a pipe?) you feel fear.