dead centre
/'ded'sentə/
Definition
Noun: 1. The precise central point or position: The exact middle point of something. 2. The position of a crank when it is in line with the connecting rod and not exerting torque: In mechanical engineering, the position in the cycle of a reciprocating engine (like in a car) where the piston is at the very top or bottom of its stroke. In this position, the connecting rod and crank are in a straight line, so no turning force (torque) is applied to the crankshaft.
Usage
- As a noun, "dead centre" is typically used to describe a state of being exactly in the middle or a point of no mechanical advantage.
- It is often used with prepositions like at, in, or off.
Examples
- General Usage (Precise Middle):
- The arrow hit the target at dead centre.
- Place the statue in the dead centre of the room.
- Mechanical/Engineering Usage:
- When the piston is at dead centre, the engine cannot be started by pushing the car.
- The mechanic adjusted the timing so the spark would fire just after top dead centre.
Advanced Usage
- "Top dead centre" (TDC): The position of the piston when it is at the very top of its stroke within the cylinder.
- The compression is highest when the piston reaches top dead centre.
- "Bottom dead centre" (BDC): The position of the piston when it is at the very bottom of its stroke within the cylinder.
- "To be at dead centre": To be in a state of complete standstill or inactivity, often metaphorically.
- The peace talks are at dead centre with no progress.
- "To move something off dead centre": To get something unstuck or to restart progress in a situation that was completely stalled.
- A new proposal was needed to move the negotiations off dead centre.
Variants and Related Words
- Dead center: An alternative spelling, especially in American English.
- Dead point: A less common synonym, especially in older technical texts.
Synonyms
- Bullseye (for the target context).
- Exact center.
- Midpoint.
- Standstill (for the metaphorical usage).
Antonyms
- Off-center.
- Periphery.
- Edge.
Related Idioms
- "Dead in the centre": An emphatic form meaning exactly in the middle.
- He stood dead in the centre of the stage.
Noun
-
the position of a crank when it is in line with the connecting rod and not exerting torque
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