Definition of inch:
(n) :
a unit of
length equal to one-twelfth of a
foot and equivalent to exactly 2.54
centimetres; the amount of water which would cover a surface to the depth of an inch, used as a measurement of
rainfall
"Don't move an inch!"
(v) :
(intransitive, followed by a preposition) To
move very
slowly (in a particular direction)
"fearful of falling, he inched along the window ledge."