There are several synonyms for the phrase "live dangerously", which imply taking risks or acting recklessly. One such term is "live on the edge", which suggests living life with a sense of excitement and danger, living dangerously. Another synonym is "walk a fine line", which means taking a big risk without knowing what the outcome will be. "Roll the dice" is another term which implies taking a chance or risking everything for a desired outcome. Similar phrases include "push the envelope", "take a leap of faith", and "ride the edge". These terms emphasize living with a sense of adventure and taking calculated or uncalculated risks.