at one's fingertips 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. [TahlilGaran] English Idioms Dictionary ▲