Investopedia explains 'Fill Or Kill - FOK'
Without a fill or kill designation, it might take a prolonged period of time to complete a large order. In reality, however, the fill-or-kill type of trade does not occur very often. Other methods of instructing a brokerage on the time frame in which a trade is to be executed include “immediate or cancel,” which means to fill all or part of the order immediately, then cancel any part that cannot be filled, and “good ‘til canceled,” which keeps an order open until it is able to be filled at a specified price.
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