# put out his eyes

"removed his eyes"

# down to Gaza

They brought Samson to Gaza which is lower in elevation than his home.

# bound him with bronze shackles

"chained him with bronze shackles" or "tied him up using bronze shackles"

# shackles

locks on the end of chains that hold a prisoner at his feet or hands, or both

# turned the millstone

"pulled the millstone around in a circle"

# millstone

A large animal usually pulls the millstone around in a circle to crush grain. The Philistines humiliate Samson here.