Idiom Breakdown

someone's heart is in

English negative polarity items

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Definition

Someone is emotionally invested in (something); someone does (something) wholeheartedly.

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"John Redwood, a longtime Eurosceptic Tory MP, said: “Sir Ivan’s heart was not in the negotiations. The talks do not need to be that complicated. If you leave, you leave. You take control of your borders, your laws and your money and that is not something that needs to be negotiated with Mrs Merkel.”"
"In September, [Richard] Lee set up a deal for him to go to top-flight Newcastle United as a reserve, but [Ben] Foster decided his heart wasn’t in it, rejected the move and retired."

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