Archaism: Word or expression widely used in earlier days which now sound very old-fashioned, such as doth, perchance, yonder and wench.
Ellipsis: Omission from a sentence of a word or phrase that is implied by the context. Ellipsis also refers to the ‘dot-dot-dot’ punctuation mark (…) used to indicate that something is missing from a quoted passage.
The original flash in the pan occurred in the old flint lock gun. The loose gunpowder carefully measured and placed in the gun’s ‘flash pan’ was meant to be ignited by a spark from the flint. If the gunpowder was damp or insufficient, however, it would fizzle or flash rather than explode effectively.