双管齐下

1. • lit. to paint holding two brushes (idiom) fig. to work on two tasks at the same time
2. • to attack one problem from two angles at the same time

Character by character

• 双(shuāng)surname Shuang
• 管(guǎn)surname Guan
• 齐(qí)(name of states and dynasties at several different periods)
• 下(xià)down