emptying (n.)

• aspiration
• bleeding
• bloodletting
• clearance
• clearing
• cupping
• defecation
• depletion
• drafting
• drainage
• drawing
• egress
• elimination
• evacuation
• excretion
• exhaustion
• phlebotomy
• removal
• sucking
• suction
• tapping
• unloading
• venesection
• venting
• voidance
• voiding