break the ice

break the ice  {v. phr.},  {informal}

1. To conquer the first difficulties in starting a conversation, getting a party going, or making an acquaintance.

To break the ice Ted spoke of his interest in mountain climbing, and they soon had a conversation going.

Some people use an unusual thing, such as an unusual piece of jewelry, to break the ice.

2. To be the first person or team to score in a game.