裏 - back, amidst, in

back (side); reverse

treachery; betrayal; perfidy

betrayer; traitor; turncoat; informer

reverse side

backdoor; rear entrance; rear exit

back lane; byway; back street

back gate

front and back; inside and outside; two sides; both sides

someone working behind-the-scenes; scene shifter

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

bribe

back and front; inside and outside; both sides