noun
close friend; best friend
Refers to a very close, trusted friend; stronger than 友達. Often implies a deep, long-term bond.
彼は私の親友です。
He is my best friend.
親友と一緒に旅行に行った。
I went on a trip with my close friend.
Composed of 親 (しん, 'intimate, parent') and 友 (ゆう, 'friend'), literally meaning 'intimate friend'.