掉 (diào) means “to fall; to drop; to lag behind; to lose; to go missing; to reduce; fall (in prices); to lose (value, weight etc); to wag; to swing; to turn; to change; to exchange; to swap; to show off; to shed (hair); (used after certain verbs to express completion, fulfillment, removal etc)”. It is an HSK 4 Chinese character in the HSK 3.0 vocabulary.
小心别把手机掉了。
Xiǎoxīn bié bǎ shǒujī diào le.
Be careful not to drop your phone.
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