to postpone / slide open
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to postpone
To move a planned task, appointment, or decision to a later time. Synonymous with 'verschieben' (to postpone/reschedule).
Ich schiebe meine Steuererklärung immer bis zum letzten Moment auf.
I always postpone my tax return until the last moment.
'Aufschieben' (to postpone/slide open) is a separable verb with the stem 'schieben' (to push/slide). The prefix 'auf' goes at the end in a main clause. Note the irregular conjugation: 'er schiebt auf' (he postpones/slides open), 'er schob auf' (he postponed/slid open), 'er hat aufgeschoben' (he has postponed/slid open).
Er schiebt die Entscheidung immer auf.
He always postpones the decision.
The meaning of 'aufschieben' (to postpone/slide open) depends on the object. If it is a task or an appointment, it means 'verschieben' (to postpone/reschedule). If it is a window or a door, it means 'öffnen' (to open).
Ich muss den Zahnarzttermin leider aufschieben.
Unfortunately, I have to postpone the dentist appointment.
When you postpone a task to a later time, use the preposition 'auf' followed by the accusative. Typical phrases are 'auf morgen' (until tomorrow) or 'auf nächste Woche' (until next week) with 'aufschieben' (to postpone).
Wir haben das Treffen auf nächsten Freitag aufgeschoben.
We postponed the meeting until next Friday.
In the meaning 'verschieben' (to postpone), 'aufschieben' is often combined with abstract things. Common phrases are: 'eine Aufgabe aufschieben' (to postpone a task), 'eine Entscheidung aufschieben' (to postpone a decision), or 'ein Problem aufschieben' (to postpone a problem).
Man sollte unangenehme Aufgaben nicht immer aufschieben.
One should not always postpone unpleasant tasks.
to open
'öffnen' and 'aufschieben' can both mean that you open something. 'öffnen' is general and only says that something is open or accessible afterward. 'aufschieben' describes the movement more precisely: you slide something to the side or upward, for example a window, a sliding door, or a bolt. That is why 'aufschieben' only fits when the opening really happens by sliding. For a normal door, a bottle, or a book, 'öffnen' is more natural.
Am Morgen schiebt Emma das kleine Fenster auf.
In the morning, Emma slides the small window open.
Sie öffnet die Tür, weil es geklingelt hat.
She opens the door because the doorbell rang.