To stare angrily.
He walked in late, with the teacher glaring at him the whole time.
To shine brightly.
The sun glared down on the desert sand.
To be bright and intense, or ostentatiously splendid.
To shoot out, or emit, as a dazzling light.
Reflecting with glare.
Blatant, obvious.
How could you miss this glaring error? It's right on page one!