ratchet
/'rætʃ/ Cách viết khác : (ratchet) /'rætʃit/
Học thuậtThân thiện
Definition
Noun:
- A mechanical device: A ratchet is a simple machine consisting of a toothed wheel or bar (the rack) and a pivoting, spring-loaded lever (the pawl). The pawl allows the wheel to turn in one direction but locks it to prevent motion in the opposite direction. This mechanism is used to permit motion in steps or to hold a position securely.
- The toothed wheel itself: The term can also refer specifically to the notched or toothed component of such a device.
Verb:
- To move by increments in one direction: To cause something to change, typically to increase or decrease, in a series of irreversible steps. The change often feels steady, controlled, and difficult to reverse.
- To operate or fasten with a ratchet mechanism: To use a ratcheting tool or device.
Usage and Examples
Noun:
- The jack uses a ratchet to hold the car in place as you lift it. (The mechanical device prevents the car from falling back down.)
- Turn the ratchet clockwise to tighten the bolt. (Referring to the toothed wheel or a tool, like a socket wrench, that incorporates one.)
Verb:
- The government's new policies are likely to ratchet up tensions in the region. (The policies will cause tensions to increase in a step-by-step, sustained manner.)
- He carefully ratcheted the strap tighter. (He tightened the strap incrementally using a ratcheting mechanism or motion.)
Advanced Usage
"To ratchet up": To increase something (like pressure, intensity, or effort) in a series of steps, often to a high level.
- Both companies continue to ratchet up their advertising spending. (They are steadily and competitively increasing their budgets.)
"To ratchet down": To decrease or reduce something gradually but firmly.
- The central bank is expected to ratchet down interest rates over the next quarter. (It will lower rates in a controlled, stepwise fashion.)
Variants and Related Words
- Ratchet wheel (n): Another term for the toothed wheel in a ratchet mechanism.
- Ratcheting (adj/gerund): Describing a tool or action that uses or resembles a ratchet.
- A ratcheting screwdriver allows you to turn the screw without removing the bit from the head.
- Pawl (n): The locking lever in a ratchet assembly that engages the teeth.
Synonyms
- Noun (Device): Catch, detent, click, stop.
- Verb (Increase): Escalate, intensify, increase, crank up.
- Verb (Decrease): De-escalate, wind down, reduce.
Related Phrasal Verbs
- Ratchet up: As defined in Advanced Usage.
- Ratchet down: As defined in Advanced Usage.
Related Idioms
- "Like a ratchet": Used to describe a process or change that moves in one direction only, often implying it is irreversible or self-reinforcing.
- Inflation can act like a ratchet; prices go up easily but rarely come down.
Noun
- mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
Verb
- move by degrees in one direction only
- a ratcheting lopping tool