We were all wide-eyed when we saw the huge fireworks explode in the night sky.

wide-eyed 是由形容词 wide（宽的）和名词 eye（眼睛）加上后缀 -ed 组成的复合形容词，字面意思是"眼睛睁得大大的"，用来形容因为惊讶、兴奋或好奇而睁大眼睛的样子。