割る

1. Origins, structure, and basic meaning

• Structure: 割る is a transitive verb read わる, meaning either to divide an amount or to break a hard object.
• Basic usage: Use 費用を四人で割る for splitting a cost among four people and 固い殻を割る for cracking a hard shell.
  • 食事の費用を四人で均等に割ることにした。 describes deciding to divide the meal cost equally among four people; 固い殻を割ると、中から白い実が出てきた。 describes a white kernel emerging when a hard shell was broken.

2. Common pitfalls and similar expressions

• 費用を割る
  • を marks the amount divided, and 四人で identifies the group sharing it.
• 殻を割る
  • Here the same verb means physically cracking an object rather than dividing a quantity.
• 割ると
  • と connects breaking the shell to the result that follows.