We've all heard the phrase that usually goes along the lines of "blah blah did something behind my back". I've always thought that from your back's point of view, anything behind you is in front of it therefore behind your back is in front of you. Is this just another unnecessary redundancy and should we all just say "behind me" or am I reading too much into this?
Learn English – Isn’t “behind your back” in front of you
expressionsgrammar
Best Answer
I think behind your back is redundant, but not nonsensical. Something that's behind your back is behind you -- not just behind your toes or your nose, but even further to the rear -- behind your furthest back part.