Term
Poach
In doubles, cutting across to hit a ball that was coming to your partner's side.
In doubles, moving over to your partner's side of the court and hitting a ball that came to your partner's side yourself (USA Pickleball).
Under the rules, there are no rules about where players stand, except when serving and receiving (5.B.4).
How to read the sources: numbers like (8.F.4) are rulebook sections, and links are outside sources. An "Author's note" is the author's personal experience, not an official rule.