This is the 864th most frequent Malay word.
mengisytiharkan
To declare.
Here, 'mengisytiharkan' means 'to declare' something formally, in this context, a public holiday.
Kerajaan telah mengisytiharkan cuti umum pada hari tersebut.
The government has declared a public holiday on that day.
In this sentence, 'mengisytiharkan' conveys the act of publicly pronouncing the commencement of an event.
Pengerusi majlis mengisytiharkan pembukaan rasmi acara tersebut.
The chairperson declared the official opening of the event.
Here, 'mengisytiharkan' is used to denote formally announcing an important status change, in this case, the nation's independence.