We don't have synonyms for sidepiece yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are timepiece, side piece and sidepipe.
(n) :
The jamb, or cheek, of an opening in a wall, as of door or window.
(n) :
Alternative spelling of side piece [(slang) A person with whom someone already in a relationship carries on a physical affair (not emotional affair) without having the intention of forming a serious relationship. Not gender specific.]
(n) :
The jamb, or cheek, of an opening in a wall, as of door or window.
(n) :
Alternative spelling of side piece [(slang) A person with whom someone already in a relationship carries on a physical affair (not emotional affair) without having the intention of forming a serious relationship. Not gender specific.]