The antonyms for the word "consign grave" are quite challenging to identify because it is an idiom, indicating a somber or serious tone. However, we can find antonyms for the individual words. Consign means to entrust or deliver, and its antonyms can be withhold, keep, or retain. Grave refers to death, seriousness, or sorrow, and its antonyms can be frivolous, lighthearted, or comical. Therefore, the antonyms for "consign grave" might be withholding frivolity, retaining lightheartedness, or keeping a comical tone. These antonyms can create a sense of lightness, humor, or relaxation, which is the opposite of the serious and somber tone of "consign grave.