1. pull on
Pull on your jacket quickly, otherwise we would be late.
2. run low
Our supplies are running low, however, we have to keep our baby warm enough.
3. squint
We lied on the lawn in the yard and squinted at the sunlight through the leaves of that big oak.
summary:
It was the first time for Harry to know that the wizards always travel to a place soon by a kind of powder named Floo powder. Although the Weasleys gave him some advice, he couldn't master the skill so that he got to a strange place when he wanted to go to the Diagon Alley, where he saw his natural enemy, Malfoy.