プログレッシブ和英中辞典(第4版)の解説
ほんごく【本国】
❶〔自国〕one's own country；〔母国〕one's home [native, mother] country; one's homeland
密入国者たちは本国へ送還された
The illegal immigrants were deported [forcibly returned] to their own country.
本国へ帰る
go [return] home
本国行きの船
a homeward-bound ship [vessel]
❷〔植民地に対し〕a suzerain [súːzərən] state
本国政府
the home government