A person who takes money out of a bank account. The withdrawer went to the ATM to take out some cash for the weekend.
A person who removes themselves from a situation or activity. As a habitual withdrawer, she often left social gatherings early to avoid feeling overwhelmed.
A person or thing that withdraws in any sense; one that pulls back, removes, or takes something away. In the experiment, the mechanical withdrawer retracted the probe after each test cycle.