"Grinning and bear it" is a phrase that is often used to describe someone who is enduring a painful or difficult situation with a brave face. However, the antonyms for this expression could be "moping and give up," "sulking and retreat," or "frowning and complain." These contrasting phrases suggest a more defeatist attitude towards life's challenges, where one chooses to give in to negative emotions instead of facing them head on. While it's natural to feel discouraged in tough times, adopting a positive outlook can make all the difference in overcoming difficulties and achieving success. Therefore, choosing to "grin and bear it" can be a powerful tool for resilience and strength.