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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.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.subbing - working as a substitute for someone who is ill or on leave of absence
work - activity directed toward making or doing something; "she checked several points needing further work"
References in periodicals archive ?
When Nelson began subbing in Aldine after spending a few years as a para-professional there, the only training available was "a video that sort of showed what was expected of you as a sub," she says.
A retired Delaware educator who has been subbing in the Georgia district for more than two years, Gosa says teachers and administrators have always been there to help her in any way.