裏

actual and hidden

inside out (e.g. socks); face down (e.g. cards)

underground website (often critical or containing unofficial information)

secret menu; secret menu item

byroad; byway

secret intelligence; underground information; confidential information; inside information

backdoor admission to a school; backdoor entry to a school; buying one's way into school; bribing one's way into a school

rear tenement

house in an alley; rear tenement

sieve (for reducing soft solids to a pulp)

Noun or participle which takes the aux. verb suru; Transitive verb

pressing (food) through a sieve; pureeing (using a sieve)

back cover (e.g. camera, watch, etc.)

unlicensed gambling establishment

back stairs

black market adult video; black market adult film

bootleg video

Slang

secret leader of a group of juvenile delinquents

Abbreviation

program in a competing timeslot (programme)

backdoor; back door

Internet slang

anonymous account (on social media; used alongside one's main account); secret account

Sensitive

Japan Sea coastal areas; Sea of Japan coastal areas

search for corroborative evidence

the reverse (side); back (side); other side; hidden side; behind the scenes

backing paper; back paper; backing sheet

paper printed or used on one side; reverse side of paper printed on one side

back (side); reverse

the inside; background; dark side (e.g. of society); behind the scenes; beneath the surface

program competing with another in the same timeslot (programme); counterprogram (television)

unlucky quarter (southwest)

back window; rear window