/ˈfɪŋgətɪp ||; ˈfɪŋgɚˌtɪp/noun [C] the end of a finger 指尖 have sth at your fingertips to have sth ready for quick and easy use 对某事物了如指掌（随时可供使用）: They asked some difficult questions but luckily I had all the facts at my fingertips. 他们问了一些不好答的问题，幸亏我熟知所有数据。