to drop; to lose; to let fall; to degrade; to fail (someone); to capture (a heart)
彼は出張先のホテルに向かう途中で、重要なオフィスの予備の鍵をどこかに_______しまい、大慌てで警察に相談しました。
On the way to the hotel of his business trip destination, he unfortunately dropped the important spare key of the office somewhere, and consulted the police in a great panic.