1.
front and back; both sides
The two physical surfaces of something — the front side and the reverse side.
2.
two sides (of a matter); duality
The idea that something has two contrasting aspects. Used to describe situations where opposing qualities coexist.
3.
duplicity; two-facedness
Having a hidden side that contradicts one's outward appearance. Used to describe inconsistency between words and actions, or public and private behavior.
Read as ひょうり in this compound form. The same kanji can be read as おもてうら in the native Japanese reading.
The key compound 表裏一体 ('two sides forming one body') is an important four-character idiom meaning that two contrasting things are inseparably connected.