- (US, slang) ghetto (unseemly and indecorous)
- A ratchet wrench.
- A mechanism composed of a ratchet wheel, or ratch and pawl.
- A pawl, click, or detent for holding or propelling a ratchet wheel, or ratch, etc.
- (analogous) A procedure or regulation that goes in one direction, usually up.
- (intransitive) To increment or decrement.
- (transitive) To cause to become incremented or decremented.
"It's time to ratchet up the intensity level here."