C1 noun/verb /ˈbɔɪ/ or /ˈbuːi/
buoy
ブイ, 浮かべる
Meaning
A floating marker on water; to keep something afloat or encourage someone.
Example
The news buoyed their spirits after the loss.
ニュースは喪失後、彼らの気持ちを高めました。