batten down the hatches idiom
钉上扣板密闭舱口，封舱
to fasten the entrances to the lower part of a ship using wooden boards
准备面对困境
to prepare for a difficult situation
When you're coming down with flu all you can do is batten down the hatches and wait for it to pass. 得了流感以后，你所能做的就是做好心理准备，等它慢慢过去。