flipside
/ˈflɪpˌsaɪd/noun
RareNot in standard dictionaries
1
The reverse, in contrast to the obverse.
2
The B-side of a phonograph record.
3
A necessary consequence or corollary of something that acts as a negation or counterbalance; especially one seen as opposite, or as pro versus con.
4
The occasion when we meet again (e.g. when I return from work, etc.; said on parting); later or tomorrow.
#informal