兵临城下 (bīng lín chéng xià) | Meaning: soldiers at the city walls (idiom); fig. at a critical juncture | Chinese Idiom with Pinyin & Origin

as secure as Mount Taishan · as solid as a rock安如泰山ān rú Tài Shān

safe and sound (idiom) · to come out unscathed (e.g. from an accident or illness)安然无恙ān rán wú yàng

to sleep peacefully (idiom) · (fig.) to rest easy · to be free of worries高枕无忧gāo zhěn wú yōu

soldiers at the city walls (idiom); fig. at a critical juncture