The phrase "that life" can be easily replaced with other similar expressions. One common synonym is "such is life," which conveys a sense of resignation or acceptance of a difficult or disappointing situation. "C'est la vie" is another French phrase that has become a synonym for "that life" in English and has a similar meaning, indicating a philosophical attitude towards life's ups and downs. Other synonyms for "that life" could include "the way things are," "such are the circumstances," or "the hand we've been dealt." Ultimately, these synonyms all refer to the realization that certain aspects of life are out of our control and must be accepted.