Antonyms for "showed a leg" could include phrases such as "hid in bed," "remained still," or "laid low." Instead of revealing themselves or taking action, someone who does the opposite might be described as staying under cover, avoiding attention, or remaining motionless. Synonyms for "showed a leg," on the other hand, might include "stepped forward," "made a move," or "took action." Depending on the context, the opposite of showing a leg could be seen as a positive or negative thing. In some cases, taking things slow and avoiding unnecessary risks may be the smarter choice.