Etymology
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blocking (n.)

1630s, verbal noun from present participle of block (v.2). By 1891 in U.S. football; by 1961 in theater.

updated on June 11, 2017

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Definitions of blocking from WordNet

blocking (n.)
the act of obstructing or deflecting someone's movements;
Synonyms: block
From wordnet.princeton.edu, not affiliated with etymonline.