HSK 7-9
丢三落四
diūsān-làsìforgetful; empty-headed
他总是丢三落四忘带钥匙。
Tā zǒng shì diū sān là sì wàng dài yào shi.
He is so forgetful that he often leaves his keys behind.
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Appears across levels (7-9) in the HSK 3.0 word list.