The phrase "quality subs" refers to high-quality substitutes or replacements. These are alternative options that are superior in terms of their excellence, usefulness, or value compared to other substitutes. Full definition
Other school systems, overwhelmed by the task of finding, training, and retaining quality subs, have begun turning to outside sources. (educationworld.com)
This can be a tough challenge given that it's not easy to deliver such world altering side quests in a story driven game But it's not like we haven't seen quality sub plots in previous iterations of the game. (thekoalition.com)
And I see good quality subs this campaign, with Lucas Perez, Gibbs, Elneny, Giroud and Ospina, soon, Welbeck. (justarsenal.com)