one's personal thoughts

private life, personal life

illegitimacy (being born out of wedlock)

a privately-owned ricefield, especially one under the historical 律令 (Ritsuryō) system

personal grudge

Kyūjitai form of 私鉄 (“private railway”)

mercury, quicksilver (the metal)

silver (lustrous, white, metallic element; symbol Ag) / Short for 銀色 (gin'iro): silvery, silver-colored / (sports, etc.) Short for 銀メダル (gin medaru): a silver medal

(chemistry) mercury; quicksilver

a silver bullet (straightforward solution perceived to have extreme effectiveness or miraculous results)