to quickly and easily write something that is usually slow or difficult to write, such as a piece of

中文解释

下笔如神（快速地、容易地写出某些内容，这些内容通常写起来较慢且难，如诗或音乐） Kate can run off a sonnet in half an hour on any subject you like. 只要你定好一个题材，凯特都能在半小时内信笔写出一首十四行诗。