{adv. phr.} 1. Within easy reach; quickly touched; nearby. * /Seated in the cockpit, the pilot of a plane has many controls at his fingertips./ 2. Readily usable as knowledge or skill; familiar. * /He had several languages at his fingertips./ * /He had the whole design of the machine at his fingertips./
AT ONE'S FINGERTIPS
Meaning of AT ONE'S FINGERTIPS in English
Slang English vocab. Английский сленговый словарь. 2012