呼 (hū): to call; to cry; to shout; to breath out; to exhale

Mom stood at the door and called out loudly for me to come home quickly for dinner.

He shouted his friend's name everywhere in the crowded station, but no one responded.

When he encounters difficulties, he always calls loudly for help, hoping someone will come to assist.

The teacher called the students' names in class to confirm everyone was present.

He had difficulty breathing and needed oxygen immediately, so the nurse urgently called for the doctor.