裏 - back, amidst, in

someone working behind-the-scenes; scene shifter

back gate

betrayer; traitor; turncoat; informer

offstage; backstage; behind the scenes

reverse side

treachery; betrayal; perfidy

backdoor; rear entrance; rear exit

one's mind

back lane; byway; back street

back and front; inside and outside; both sides

support (e.g. for an argument); backing; proof; evidence; corroboration; substantiation; guarantee; security

to support (a theory, claim, etc.); to back up; to substantiate; to prove