"out the window" is used informally, but it is not very good English, especially when written. Use "out of the window" instead.
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Hans51Thank you so much and what about the difference between drop and throw? Is there a nuance between them?"drop" means let go and allow gravity to take effect. "throw" typically implies more force. For example, if you were inside the room, and force was required to propel the trash through the window, then that would be "throw".