to finger smth

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have smth at one's finger-tips/ends — (from Idioms in Speech) to be able to repeat or use without any trouble (generally of something committed to memory); to be very familiar with something He had all the figures, all the facts at his finger ends. (A. Cronin) There s no need to… … Idioms and examples
put one's finger on smth — locate precisely, remember exactly I was unable to put my finger on the exact date of his arrival … Idioms and examples

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