He's got a serious mind, Izzy has, and if you could take a thumbprint of his brain, it would be all fractions and dollar signs.
He ran a red-tinted, celluloid rectangle through a stamping machine and Hunter pressed his thumbprint upon the signature square.
The thumbprint which we puzzled our heads over was a toe-print!
Let her have it; be sure to get her thumbprint, though, and send it up here for comparison.
It responded to the individual pattern of his thumbprint, and the bag fell open.
Kindly include your full name, as well as your daughter's, and place your thumbprint on the opposite side of the disk.
What is characteristic and individual about one's personality, work, etc; one's seal or cachet: The director has achieved what is known in the theater as his thumbprint (1951+ Theater)