Meanings of unanticipated side in English

Methods: The three-dimensional motion and force data of 34 amateur Australian rules footballers conducting unanticipated side-cutting maneuvers were collected.

There could be unanticipated side-effects.

Sadly, the drug's unanticipated side effects had not emerged until years later when Sinskey passed through puberty... and yet never developed a menstrual cycle.

"We engineered Spinsters, cultivated the creative, life-giving nature of women, but Tailors were an unanticipated side effect."