To run up to or rush over to someone/something; an intransitive verb for quickly approaching.
道端の子猫に子どもが駆け寄った。
A child ran up to the kitten on the roadside.
彼女が倒れると、周りの人々がいっせいに駆け寄った。
When she fell, the people around her all rushed over at once.
犬が名前を呼ぶと駆け寄ってきた。
The dog ran over when its name was called.
怪我人に駆け寄って救急車を呼んだ。
I rushed over to the injured person and called an ambulance.