become concerned
NYTから。「連絡がつかないのを心配して、不審に思って」という日本語に相当する表現です。（Shou-VR*）
Philip Seymour Hoffman, Actor, Dies at 46
The actor Philip Seymour Hoffman was found dead in his New York apartment on Sunday morning of an apparent drug overdose, according to a law enforcement official who requested anonymity because he was not certain the actor’s family had been informed of the death.
The official said Mr. Hoffman, 46, had been found in his West Village apartment around 11:30 a.m. by a friend who had become concerned at not being able to reach Mr. Hoffman.
