Pls help me to explain the "yield up"?

yeild up可解作：to give up the control of or responsibility for something, often because you have been forced to:（交出的意思）
你的租約，可能是說到，當某事發生後（你並未說明），租客就需將上述單位、單位設施、傢俬等交出。
希望幫到你！

yield up=出產量

surrender,as a result of pressure or force.意思是投降.

yield up --> literary to show or give someone something that has been hidden for a long time or is very difficult to obtain 泄露、揭示
e.g. --> Little by little, the universeyield up its many secrets.宇宙一點一點地顯露出許多秘密。