The phrase "gives once over" typically means to quickly survey or inspect something. Antonyms for this phrase could include "detailed examination," "thorough scrutiny," or "deep analysis." These antonyms indicate a more in-depth and careful approach to inspecting something, rather than a quick glance. Other antonyms could include "ignores," "neglects," or "avoids," which imply a lack of attentiveness or disregard for the object being inspected. Overall, the antonyms for "gives once over" suggest a more thoughtful and diligent approach to examining something, rather than just briefly scanning it.