dart a glance at (someone or something)
To look at someone or something quickly. That boy just darted a glance at you again! I think he likes you! You only darted a glance at that sign, so how could you possibly know what it says?
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.