This is the 4377th most frequent Arabic word.
هنأ
To congratulate.
In this sentence, 'هنأ' is used to express congratulations offered by the teacher.
هنأ المعلّم الطالب على النجاح.
The teacher congratulated the student on the success.
Here, 'هنأ' is in its passive form to indicate that the champion received congratulations.
هُنِّئَ البطل على فوزه بالميدالية الذهبية.
The champion was congratulated on winning the gold medal.
In this usage, 'هنأ' appears in its present tense and shows an ongoing act of congratulation.