blocker
Americannoun
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a person or thing that blocks.
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Football. a player whose assignment or special skill is blocking.
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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.
noun
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a person or thing that acts as a block
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physiol an agent that blocks a physiological function, such as the transport of an ion across an ion channel
Etymology
Origin of blocker
Middle English word dating back to 1200–50; see origin at block, -er 1
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Kolar was more blocker than receiver in his four years with the Ravens, and he did that very well.
From Los Angeles Times ● Jul. 23, 2026
Until the entire digital economy gets a severe overhaul, it’s safest to assume that modern-day social media is just a wholesale ad network that’s left your ad blocker in the dust.
From Slate ● Jun. 27, 2026
Dame Hilary Cass says puberty blocker trial is "essential"
From BBC ● Jun. 22, 2026
“I really thought that could have been a blocker, and I want to make sure it’s not,” he said.
From The Wall Street Journal ● May 21, 2026
He could hit like a locomotive and was a devastating blocker.
From "October Sky" by Homer Hickam
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
