搜索枯肠（搜索枯腸）　

◎ 搜索枯肠 sōusuǒ-kūcháng

[rack one‘s brains (for fresh ideas or apt expressions)] 比喻作诗文冥思苦想

宝玉只得答应着,低头搜索枯肠。——《红楼梦》