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a person or thing that blocks.
Football. a player whose assignment or special skill is blocking.
Biochemistry. a substance that inhibits the physiological action of another substance, as the beta blocker propranolol that interferes with neurotransmitters in the sympathetic nervous system.
Historical Examples

Wells Brothers Andy Adams
Punch, or the London Charivari, Vol. 107, December 22, 1894 Various

a person or thing that acts as a block
(physiol) an agent that blocks a physiological function, such as the transport of an ion across an ion channel


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