Definition of a spent forcechiefly British
- He was once one of the most powerful men in the government, but now he's largely a spent force.
: used up : consumed
: exhausted of active or required components or qualities often for a particular purpose
: drained of energy or effectiveness : exhausted
: strength or energy exerted or brought to bear : cause of motion or change : active power
used with a number to indicate the strength of the wind according to the Beaufort scale
: moral or mental strength
: to do violence to
: to compel by physical, moral, or intellectual means
: to make or cause especially through natural or logical necessity
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