Definitions for "fill or kill"
An order given to a broker that must immediately be filled in its entirety or,...
An order stipulation instructing the broker to present the order in the marketplace and either fill it in its entirety or kill it if it cannot be filled immediately at its stipulated price limit.
A market or limit-price order that is to be executed in its entirety as soon as it is represented in the market; if not so executed, the order is to be canceled.