dart a glance at someone or something
to shoot a quick look at someone or something. She darted a glance at him and looked quickly away. He darted a glance at the door and looked even more uncomfortable.
dart about
to move about quickly. The little fish were darting about everywhere. People were darting about, to and fro, during the noon rush hour.
dart across something
to run quickly over something. A small animal darted across the road in front of the car. I tried to dart across the street, but the traffic was too heavy.
dart in and out
[for something moving] to move quickly between two things, or into a number of things, and move away again. On the highway, a small car was darting in and out of the two right lanes of traffic. A small bird darted in and out of the bush, probably going into a nest inside.
dart out (of something) (at someone or something)
to move quickly out of something toward someone or something. The ferret darted out of its burrow at the children. The snake darted out at the frog. The mouse darted out of its hole.