What does «obcecar» mean in Spanish?

Blind, obfuscate.

Examples of use in Spanish: "Durante el examen los nervios obcecaron al alumno, por eso no aprobó".
Being unable to think rationally, holding fast to an idea, intention or opinion.

Examples of use in Spanish: "Se ha obcecado en marcharse hoy mismo".

"No nos podemos obcecar con nuestros objetivos".