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.

Alternative Expressions

Related Expressions