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It is synonymous with the following:

He [smiles/becomes happier] when he looks at the treat

>**brighten** to start looking or feeling happier *She frowned anxiously, then suddenly her face brightened.*

(Macmillan)

It is synonymous with the following:

He [smiles/becomes happier] when he looks at the treat

It is synonymous with the following:

He [smiles/becomes happier] when he looks at the treat

>**brighten** to start looking or feeling happier *She frowned anxiously, then suddenly her face brightened.*

(Macmillan)

Post Migrated Here from english.stackexchange.com (revisions)
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It is synonymous with the following:

He [smiles/becomes happier] when he looks at the treat