They smiled at each other.

Meaning: The two people involved expressed happiness towards one another.

Choice of Words: They refers to the two people involved, smiled means expressed happiness, at indicates the target of the smile, each means one another, other refers to the second person involved.

Alternative Expressions

The two of them exchanged smiles.

Meaning: This also means that two people showed happiness or amusement towards each other by turning up the corners of their mouths.

Choice of Words: The two of them refers to the same two people as in the previous sentence. Exchanged means to give and receive something in return. In this case, the two people are giving and receiving smiles.

Their faces lit up with smiles.

Meaning: This means that two people showed happiness or amusement by turning up the corners of their mouths, and their faces became bright or full of light because of their smiles.

Choice of Words: Their refers to the two people's faces. Faces are the front part of the head that includes the eyes, nose, and mouth. Lit up means to become bright or full of light. In this case, the two people's faces became bright or full of light because of their smiles.

Related Expressions