Daily Chinese Idiom Guessing Game
Worry about future troubles; a lingering concern about something that could cause problems later.
顾回头看。来自后方的忧患。指在前进过程中，担心后方发生问题。
《魏书·李冲传》朕以仁明忠雅，委以台司之寄，使我出境无后顾之忧。”
Before leaving for vacation, she took care of all the bills so she wouldn't have any rear worries.