solicitude befitting an older brother or elder
Archaic noun referring to the considerate, protective attitude expected of an older brother or senior figure. Not used in modern Japanese.
In old texts, the word 兄心 can express the thoughtfulness expected of an elder.
Compound of 兄 (このかみ, older brother) and 心 (こころ, heart/mind). The reading このかみ is itself archaic. The exact historical derivation is uncertain.