寅忧夕惕[ yín yōu xī tì ]

⒈ 寅：寅时，泛指早晨。多指执政者忧心忡忡，早晚提心吊胆。例仰系鸿丕，顾临兆民，永怀先构，若履春冰，寅忧夕惕，罔识攸济。——《南齐书·明帝纪》英be on tenderhooks from morning till evening;