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Communication should allow the two partners to avoid being surprised by the movements of the other, to avoid any error.
Warnings
Instead of long discussions, it's better to use terms agreed upon in advance, such as "ok", "go", "take", "climb"... For this, the moments where communication is required must be identified in advance.
When the climber puts his/her weight on the rope for lowering, the climber is still tethered to the anchor. This allows for checking that the belayer is actually ready to hold the climber's weight. Once everything is checked, the climber untethers for lowering.