When it comes to finding synonyms for the phrase "yield up," there are many possible options to choose from. Some common alternatives include surrender, relinquish, give up, abandon, forsake, and concede. Each of these words carries a slightly different connotation and nuance, but all ultimately convey the idea of giving something up or letting go of control. Other synonyms for "yield up" might include cede, hand over, deliver, render, or turn over. Depending on the context and desired tone, any of these options could serve as a suitable replacement for "yield up".