For example, someone might say "That happens to me every single time I go there," when they could say "That happens to me every time I go there." Is it just a way of emphasizing the word "every"?
When spoken with anger or frustration, the first syllables are emphasized. It can be spoken as "ev'ery sing'le time" in a syncopated rhythm, like pounding a table with a fist.
But does the word "single" carry any extra meaning, or is it just a way of underlining "every" (and "single" is redundant)?
Edit: The same question goes for "every last", even though it isn't as rhythmic. Thanks to V.V. for finding this similar idiom.