Antonyms for "grins bear it" could include phrases such as "frown and express it," "speak out and confront it," or "turn away and ignore it." Instead of forcing a smile and pretending everything is okay, one could choose to be honest with their feelings and address the situation head-on. Facing difficult situations can be uncomfortable or intimidating, but it is often necessary to find resolution and move forward. By expressing oneself truthfully, one may find relief and the opportunity for growth and healing.