asumir

To take on or assume — a responsibility, role, cost, or risk (asumir el cargo, asumir la culpa, asumir los gastos). It also covers the more abstract "to accept as true, come to terms with" (asumir la realidad, asumir que se equivocó), closer to English's "to come to grips with" than to the false-friend sense of merely guessing.

• Asumió la responsabilidad del error. — She took responsibility for the mistake.
• Tuvo que asumir el coste de la reparación. — He had to bear the cost of the repair.
• Todavía no ha asumido que perdió el trabajo. — He still hasn't come to terms with losing his job.

Using asumir the way English uses "to assume" meaning "to guess or suppose without proof" — that sense is better covered by suponer; asumir leans toward taking on a duty or accepting a hard truth, not idle guessing.

Often confused with suponer.