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The literal meaning of Waqof is to stay. The stay at Arafat for a while from the time after Zuhr (Midday) on the 9th of Zilhijja up to the daybreak (on the 10th) is the basic fundamental of Hajj. It is Wajib to stay at Arafat till sunset of the 9th. It is Mustahab to take a bath before moon but if it is difficult, making an ablution only will also suffice. Being so prepared a pilgrim should go to Masjid-e-Namira. Here the Imam-ul-Muslimin (The leader i.e., ruler of the Muslims) or his vicegerent will deliver the 2nd Khutba of Hajj which is Sunnat, not Wajib. He will then lead the congregation of Zuhr and Asr prayers taking them togather in the time of Zuhr. In this case two Sunnat prayers of Zuhr will be abandoned.
Rule Of Action
On the day of Arafa in Arafat, this combining of Zuhr and Asr prayers togather in the time of Zuhr is Sunnat or Mustahab but this is subject to the condition that you are wearing the Ihram of Hajj and the prayers are performed in the leadership of Imam-
ul-Muslimin or his vicegerent. Firstly Zuhr and then Asr prayers are to be performed separately.  Read more... (1621 words, estimated 6:29 mins reading time)

The practice and fundamentals of Hajj commence in a chain from the 7th day of Zilhijja. On the 7th day the Imam delivers the first Khutba of Hajj after Zuhr prayers wherein he explains the practices of Hajj and gives a program for the next five days.