a metal peg-and-gear mechanism for tuning a string on an instrument such as a guitar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use machine head in a sentence
The device is constructed of another sewing-machine head similar to the one already described.
The small handwheel, originally mounted on the machine-head shaft, is left intact.
The width of the pieces will depend on the kind of sewing-machine head used.
In the margins are the perforations necessary to feed the film through the machine head.The Wonder Book of Knowledge | Various
A while ago one of the men got his necktie caught between the cogwheels and he was drawn into the machine head first.Sure Pop and the Safety Scouts | Roy Rutherford Bailey