Senses
背靠背 back to back
with backs against each other
背靠背 behind one's back
separately or without someone else's knowledge; to critique or report someone while they are not present
背靠背 consecutive
happening one after another; specifically used in sports for games on consecutive days or consecutive home runs
背靠背 back-to-back
a business arrangement where an intermediary links two parties who do not deal directly, resulting in two separate but identical contracts