Screw on dispensing closure with structure for preventing removal

A screw on plastic dispensing closure for a container includes a closure main body that is adapted to be screwed on to a container and that has a top portion in which an orifice is defined for dispensing a substance from the container and a downwardly depending skirt portion having an inner surface on which at least one interior thread is defined for engaging threading on the container. The closure further includes a lid member that is hingedly mounted to the closure main body for movement between a first closed position in which the lid member covers the orifice and an open position wherein the orifice is uncovered by the lid member. Advantageously, retention structure is provided on the closure main body for engaging the container in such a manner as to frustrate efforts that may be made to unscrew the closure from the container after the closure has been first screwed on to the container.