Artificial intelligent assistant

finger-nail

ˈfinger-ˈnail
  One of the nails of the fingers. to one's finger nails: completely, thoroughly.

a 1240 Wohunge in Cott. Hom. 281 Þat te blod wrang ut at tine finger neiles. 1842 Tennyson E. Morris 22 He seem'd All-perfect, finish'd to the finger nail. 1884Becket iii. i, He's as like the King as fingernail to fingernail. 1888 Graphic Summer No. 21/1, I was a theosophist to my finger-nails.

Oxford English Dictionary

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