John Gill Commentary Job 33:5

"If thou canst, answer thou me; Set [thy words] in order before me, stand forth." — Job 33:5 (ASV)

If you can answer me
That is, when he had done speaking, after he had heard him out; if he thought he could make a reply to him, he gave him full liberty so to do, and tacitly suggests that he should give him an attentive and candid hearing, as he had requested of him:

set [your words] in order before me ;
put them into the best form and order you can for your self-defence, and level them at me; set them, as it were, in battle array against me; give them all the poignancy, strength, and three you are capable of:

stand up ;
not out of veneration to him, but to denote freedom and boldness in himself; a presentation of himself with boldness, and standing and keeping his ground: the expressions are military; Mr. Broughton renders it, "stand to it".