Smiles spread widely across faces.
Meaning: Expressions of happiness on people's faces became wider or more extensive to a great extent or degree from one side to the other of the front parts of people's heads.
Choice of Words: Smiles are expressions of happiness on people's faces, spread means they became wider or more extensive, widely means to a great extent or degree, across means from one side to the other, faces are the front parts of people's heads.
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