Definitions from Wiktionary ( )

▸ verb:  (transitive) To make something flat or flatter.
▸ verb:  (reflexive) To press one's body tightly against a surface, such as a wall or floor, especially in order to avoid being seen or harmed.
▸ verb:  (transitive) To knock down or lay low.
▸ verb:  (intransitive) To become flat or flatter; to plateau.
▸ verb:  (intransitive) To be knocked down or laid low.
▸ verb:  (music) To lower by a semitone.
▸ verb:  To make vapid or insipid; to render stale.
▸ verb:  (programming, transitive) To reduce (a data structure) to one that has fewer dimensions, e.g. a 2×2 array into a list of four elements.
▸ verb:  (computer graphics, transitive) To combine (separate layers) into a single image.

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