Ratchet

Noun

 * 1) A pawl, click, or detent for holding or propelling a ratchet wheel, or ratch, etc.
 * 2) A mechanism composed of a ratchet wheel, or ratch and pawl.
 * 3) A ratchet wrench.

Verb

 * 1)  To cause to become incremented or decremented.
 * 2)  To increment or decrement.
 * It's time to ratchet up the intensity level here.

Thesaurus
cog, comb, crag, fang, harrow, jag, peak, pecten, projection, rake, sawtooth, snag, snaggle, spire, sprocket, spur, steeple, tooth