There are several synonyms for the phrase "shift for oneself" including to fend for oneself, to take care of oneself, to manage on one's own, to survive independently, and to stand on one's own two feet. All of these phrases imply the ability to be self-sufficient and independent in life, whether it be in terms of financial stability, emotional support, or personal responsibility. It is important to be able to shift for oneself in life, as it allows for personal growth and development, and also helps to foster a sense of resilience and determination that can be beneficial in the face of adversity.