苦杯

1. Origins, structure, and basic meaning

• Structure: 苦杯 is read くはい and means a bitter defeat.
• Basic usage: It appears in the experience of losing again to the same opponent and using that defeat as motivation to practice.

2. Common pitfalls and similar expressions

• Suffering defeat
  • 苦杯をなめた expresses having suffered a bitter defeat.
• Using defeat as motivation
  • 苦杯をばねに means using a past defeat as motivation for further effort.