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sub 1

1. Nautical A submarine.
2. A submarine sandwich.

sub 2

 (sŭb) Informal
A substitute.
v. subbed, sub·bing, subs
To act as a substitute: a graduate student subbing for the professor.
1. To put or use (a person or thing) as a substitute: The coach subbed fresh players toward the end of the game. The cook subbed oil for butter.
2. Usage Problem To replace; substitute: The player was subbed after she committed two errors. Sub the chicken with tofu to make the dish vegetarian. See Usage Note at substitute.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


pl n
money paid to be a subscribing member of a club, organization, etc
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
The best I did was to scrape alongside the sub. I heard someone shriek an order into the engine-room; the boat shuddered and trembled to the sudden reversing of the engines, and our speed quickly lessened.
"I know more about this particular sub than the officer who commanded her."
"The subs around here are becoming pretty selective of where they want to go," Haas says.
Finding good subs is also more important today because teachers attend in-service sessions more frequently than in the past.
Now, subs need to understand No Child Left Behind and other factors influencing education, says Thome, a former superintendent who is now assistant superintendent of human resources and technology for the county.
Who are these super subs? Administrators and experts say the recently retired (particularly teachers mad other professionals), those in teacher education programs or who have teaching aspirations, and moms with children in school tend to lit the bill.