What is another word for was on back?
Pronunciation: [wɒz ˌɒn bˈak] (IPA) 
The phrase "was on back" can have several synonyms depending on the context of its usage. It can be replaced by "was laid up," "was bedridden," or "was confined to bed," all indicating that someone was unable to stand or move freely due to an injury or illness. In the context of a sport or game, the phrase "was on the bench" can be used, indicating that a player was not actively participating in the game. For a less severe condition than bedridden, one may use "was resting" or "was taking a break." In casual conversation, one could say "was down for the count," indicating that the person was too ill or exhausted to function.
