-아/어 두다 means to do something and maintain the result - "do and keep," often implying preparation.
Preparation - 사 둘게요 (Ill buy it and keep it ready)
Maintaining state - 문을 열어 두세요 (Leave the door open)
For future benefit - Doing now for later use
Similar to -아/어 놓다 but 두다 emphasizes keeping for future use
Contracts in speech
- 사 두다 → 사 두다/사둬
- 열어 두다 → 열어 둬
I booked the tickets in advance.
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