The American Heritage® Dictionary of the English Language, 4th Edition
n. A mechanism consisting of a pawl that engages the sloping teeth of a wheel or bar, permitting motion in one direction only.
n. The pawl, wheel, or bar of this mechanism.
v. To cause to increase or decrease by increments: "Some companies . . . may make things worse if they seek to ratchet down their medical expenses by limiting benefits for psychological or psychiatric care” ( Newsweek).
verb-intransitive. To increase or decrease by increments.
n. A pawl, click, or detent for holding or propelling a ratchet wheel, or ratch, etc.
n. A mechanism composed of a ratchet wheel, or ratch and pawl.
n. A ratchet wrench.
n. A procedure or regulation that goes in one direction, usually up.
v. To cause to become incremented or decremented.
v. To increment or decrement.
the GNU version of the Collaborative International Dictionary of English
n. A pawl, click, or detent, for holding or propelling a ratchet wheel, or ratch, etc.
n. A mechanism composed of a ratchet wheel, or ratch, and pawl. See Ratchet wheel, below, and 2d Ratch.
The Century Dictionary and Cyclopedia
n. A detent or pivoted piece designed to fit into the teeth of a ratchet-wheel, permitting the wheel to rotate in one direction, but not in the other.
n. In printing, a notched straight blade of brass which rotates the pinions attached to the movable clamps of an electrotype plate mounted upon a block.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. move by degrees in one direction only
n. mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
Word Usage
"Maybe you believe government spending has a built in ratchet that prevents it from ever really coming down, no matter what party is in power."