a heart of stone

noun phrase

Definition of a heart of stone

 (Entry 1 of 2)

: an inflexible and unfriendly or unkind disposition She has a heart of stone.

sink like a stone

idiom

Definition of sink like a stone (Entry 2 of 2)

: to sink very suddenly and quickly The ship hit an iceberg and sank like a stone. often used figuratively His last movie sank like a stone.

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