プログレッシブ和英中辞典(第4版)の解説
たんしん【単身】
彼は単身上京した
He came to Tokyo 「by himself [alone].
単身で商売を始めることにした
He decided to start a business single-handed [on his own].
単身銃
a single-barreled gun
単身赴任
家族を東京に置いて単身赴任する人が多い
There are many who take up posts [jobs] in another city, leaving their families behind in Tokyo.