Mr. Johnson will be 'subbing' [=working as a substitute teacher] at the high school.
('US') We had a 'sub' [='substitute teacher'] in English class all week.
Jones 'was subbed' (by Smith) at halftime.
(..) Two minutes at the end Roberto Carlos with a high-lofted ball. Desperation time, really, for Real Madrid. The super sub with a super goal! Two-two! Arsenal's shell-shocked. The Bernab'u is rocking. They really believe they could win this final now. (..)2007 Goal II: Living the Dream
(..) - Rolling. - , take . And action! That's why I go for Total Tofu every time. "The super food for the super sub." All right, cut! Great. That was great. One more time, then, Santiago. Did you do that? Well, it says here you did, Phil. (..)2007 Goal II: Living the Dream