1. moved or operated by means of a ratchet mechanism (past tense of ratchet)
Usage: mechanical/technical
2. increased or decreased by degrees; escalated gradually (past tense of ratchet)
Usage: often used with 'up' or 'down'

Examples

• He ratcheted the wrench to tighten the bolt.
• The mechanic ratcheted the jack handle to lift the car.
• Tensions ratcheted up between the two countries.
• The company ratcheted down its production costs.
• Security measures were ratcheted up after the incident.
• The debate ratcheted the pressure on both candidates.
• She ratcheted the tool clockwise until it was secure.