Anxiety that comes from looking behind oneself
This refers to anxiety that one may feel about something at home or something that is physically behind them (such as an attack)
Neutral
孩子今年考上了研究，这下我就没有后顾之忧了 | Háizi jīnnián kǎo shàng le yánjiūshēng, zhè xià wǒ jiù méiyǒu hòugùzhīyōu le
My kid got into graduate school this year, so I'm no longer worried
[Source]
最优质的服务，让你的货物出口无后顾之忧 | Zuì yōuzhì de fúwù, ràng nǐ de huòwù chūkǒu wú hòugùzhīyōu
Top quality service allows you to not worry about exporting your goods
[Source]
None
后顾之虑 (hòu gù zhī lǜ)
后顾之虞 (hòu gù zhī yú)
This is an HSK chengyu
《魏书》(Wèi Shū), a work by 魏收 (Wèi Shōu) of the Qí Dynasty (齐, 550 - 557) during the Northern and Southern Dynasties period (南北朝时期 | Nán Běi Cháo Shí Qī | 420 - 589)
In the Northern Wei of the Northern Dynasties (北魏 | běi wèi | 386 - 534), there was a prime minister named 李冲 (Lǐ Chong). 李冲 was an extremely capable minister, and the emperor, 孝文帝 (Xiào Wén Dì), trusted and relied upon him heavily. Every time that the emperor engaged in a military campaign, 李冲 would ensure that the affairs of state were in order. When 李冲 passed away on a campaign that the emperor was leading, the emperor was distraught. "With 李冲 gone," he said, "who will take care of the court when I go away?" The chengyu 后顾之忧 comes directly the emperor's statement.