rejoice

1. Origins, structure, and basic meaning

• Structure: 喜 means rejoicing; its on-reading is き and its kun-reading is よろこぶ.
• Basic usage: 喜ぶ describes being delighted, while 喜び, read よろこび, is the noun joy.

2. Common pitfalls and similar expressions

• The person delighted and the source of delight
  • 喜びを感じた means that someone felt joy. It presents the emotion as a noun instead of making a statement with 喜ぶ.
  • 祖父が喜ぶ贈り物 means a gift that would delight one's grandfather.