on the front burner

: forehead

: external and often feigned appearance especially in the face of danger or adversity

: vanguard

: to have the front or principal side adjacent to something

: to act or serve as a cover or front (see ¹front 7a) for something or someone

: to assume a fake or false personality to conceal one's true identity and character

: of, relating to, or situated at the front

: acting as a front

: articulated at or toward the front of the oral passage

: one that burns: such as

: the part of a fuel-burning or heat-producing device (such as a furnace or stove) where the flame or heat is produced

: a device for recording data on an optical disk