割り勘

1. Origins, structure, and basic meaning

• Structure: 割り勘 (わりかん) joins dividing 割り and reckoning 勘 to denote splitting a shared bill.
• Basic usage: It is used when friends or group members each pay a share of a meal or other cost.

2. Common pitfalls and similar expressions

• Shared payment rather than one payer
  • 割り勘にする shifts the expense from a single host to the participants, each covering an agreed share.