A liquid discharge apparatus configured to discharge the liquid onto an object and comprising a head unit comprising a liquid discharge head including: a nozzle plate having a nozzle; a liquid chamber configured to store a liquid to be discharged from the nozzle; a valve body in the liquid chamber, the valve body being movable between a contact position at which the valve body contacts the nozzle plate to close the nozzle and a separated position at which the valve body is separated from the nozzle plate to open the nozzle; a valve body coupler coupled to the valve body; and a driver configured to drive the valve body coupler to move the valve body; and circuitry configured to move the valve body between the contact position and the separated position to open and close the nozzle in a first operation; and apply vibration to the valve body while the valve body is temporarily held at the separated position in a second operation, wherein the liquid discharge apparatus further comprises a pressure mechanism configured to pressurize the liquid in the liquid chamber, characterized in that the circuitry is further configured to execute the first operation while the pressure mechanism applies a pressure to the liquid in the liquid chamber to discharge the liquid from the nozzle; and execute the second operation while the pressure mechanism temporarily stops application of the pressure to the liquid in the liquid chamber. a head unit comprising a liquid discharge head including: a nozzle plate having a nozzle; a liquid chamber configured to store a liquid to be discharged from the nozzle; a valve body in the liquid chamber, the valve body being movable between a contact position at which the valve body contacts the nozzle plate to close the nozzle and a separated position at which the valve body is separated from the nozzle plate to open the nozzle; a valve body coupler coupled to the valve body; and a driver configured to drive the valve body coupler to move the valve body; and a nozzle plate having a nozzle; a liquid chamber configured to store a liquid to be discharged from the nozzle; a valve body in the liquid chamber, the valve body being movable between a contact position at which the valve body contacts the nozzle plate to close the nozzle and a separated position at which the valve body is separated from the nozzle plate to open the nozzle; a valve body coupler coupled to the valve body; and a driver configured to drive the valve body coupler to move the valve body; and circuitry configured to move the valve body between the contact position and the separated position to open and close the nozzle in a first operation; and apply vibration to the valve body while the valve body is temporarily held at the separated position in a second operation, wherein the liquid discharge apparatus further comprises a pressure mechanism configured to pressurize the liquid in the liquid chamber, characterized in that the circuitry is further configured to execute the first operation while the pressure mechanism applies a pressure to the liquid in the liquid chamber to discharge the liquid from the nozzle; and execute the second operation while the pressure mechanism temporarily stops application of the pressure to the liquid in the liquid chamber. execute the first operation while the pressure mechanism applies a pressure to the liquid in the liquid chamber to discharge the liquid from the nozzle; and execute the second operation while the pressure mechanism temporarily stops application of the pressure to the liquid in the liquid chamber.