to try hard to think of or find sth, especially when this is difficult :
She cast around desperately for a safe topic of conversation.
to try hard to think of or find sth, especially when this is difficult :
She cast around desperately for a safe topic of conversation.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005