Word

男心と秋の空

exp
おとこごころとあきのそら
a man's heart and autumn weather (are both fickle)
Word

接心

摂心
せっしん、しょうしん
concentration; period of intensive zazen
Word

心臓死

しんぞうし
cardiac death
Word

石門心学

せきもんしんがく
Edo-period popularized blend of Buddhist, Shinto and Confucian ethical teachings (popularised)
Word

心臓専門医

しんぞうせんもんい
cardiologist; heart specialist
Word

金剛心

こんごうしん
extreme religious piety; unshakable faith
Word

心臓穿刺

しんぞうせんし
cardiocentesis
Word

心臓破り

しんぞうやぶり
heart-breaking (esp. in physical activity such as running)
Word

警戒心を解く

けいかいしんをとく
to let down one's guard; to relax one's guard
Word

水心あれば魚心

exp
みずごころあればうおごころ
if you do a favor for somebody, you will get a return favor; if the water is kind to fish, the fish will be friendly toward water too; mutual back-scratching