atrasar

To delay, set back, or fall behind — atrasar un reloj (set a clock back), atrasar un pago (be late on a payment), or reflexively atrasarse for a person or a train running late. The opposite of adelantar.

• Hay que atrasar el reloj una hora en otoño. — You have to set the clock back an hour in fall.
• El vuelo se atrasó por el mal tiempo. — The flight was delayed because of bad weather.
• Se atrasó tres meses con el alquiler. — He fell three months behind on rent.

Using atrasar and retrasar as if only one were correct — they're near-interchangeable synonyms across the Spanish-speaking world, though retrasar is somewhat more common in Spain and atrasar in Latin America.

Often confused with retrasar.