(sudden) change;  reversal;  turn-around;  coming from behind (baseball)
 treason;  treachery;  mutiny;  rebellion;  insurrection
 opposite effect;  adverse effect;  backfiring
 counter-current;  adverse tide;  regurgitation (of blood)
 conversely;  on the contrary
 going into a frenzy;  flying into a rage
 underhand grip;  backhand grip (e.g. in tennis);  unexpected twist;  turning the tables (on an opponent)
 the opposite direction;  the other way
 retrogression;  reversal;  relapse;  doubling back;  backtracking
 snapping back (at someone);  lashing out (despite being in the wrong);  counterblast;  counteroffensive;  backlash
 rubbing the wrong way (e.g. a cat);  irritating
 opposite side;  other side
 rebel;  traitor;  insurgent
 reverse movement;  retrogression;  going backwards;  retrogradation;  retrogression
 counting backwards;  calculating backwards;  inverse operation;  reverse operation
 atrocity; (arch.)  treason
 going in the opposite direction;  going against the wind;  running or operating a machine in reverse (such as an electric motor)
 opposite direction;  reverse;  retrorse
 phone trace;  detecting the source of a telephone call
 vice versa;  also the converse;  reverse is true
 spinning the opposite way;  backspin (tennis, baseball);  counter
 reverse thrust;  retrofiring;  sudden mental derangement
 vice versa;  also the converse;  reverse is true
 inverted position (tarot card, etc.);  reversed position
 abuse;  misuse;  taking advantage of
 man who marries a wealthy or upwardly-mobile woman;  (male) gold digger
 right and wrong;  loyalty and treason;  obedience and disobedience
 reverse rape;  sexual assault by a female of a male
 reimportation;  reimport;  reverse import;  (cultural, etc.) reverse import (e.g. California rolls being introduced in Japan)
 reverse sexual harassment;  sexual harassment of males by females
 bad deed which ultimately results in the creation of a good Buddhist;  older person conducting a funeral service for a younger relative, in particular, a parent for a child
 asking a question back (e.g. to an interviewer)
 man marrying into wealth and power
 reciprocal;  inverse number;  multiplicative inverse
 reverse order;  following a contrary path
 backlight (in photography, etc.);  illumination (of the subject) from behind
 chocolate given by a boy to a girl on Valentine's day (the other way around is the norm in Japan)
 inverse;  reverse;  retro-;  contra-
 (discount rate) negative spread;  loss margin;  back spread;  downturn
 reverse lookup (e.g. dictionary, address resolution, etc.)
 reverse course;  reversion
 right-facing swastika;  clockwise swastika
 five cardinal sins (killing one's father, killing one's mother, killing an arhat, shedding the blood of a Buddha, causing a schism within the sangha);  crime of killing one's master, father, grandfather, mother, or grandmother
 bad luck;  reverse of fortune
 crime of killing one's master or parent (Edo period);  very grave sin
 reverse-imported vehicle (esp. high-displacement motorcycles meant for sale outside Japan)
 reverse auction;  name-your-price auction
 reverse Polish notation;  RPN
 inverse trigonometric function;  cyclometric function
 unfavourable condition;  adverse position
 shielding;  reverse clipping
 inverse Fourier transform
 inverse Fourier transform
 reverse Polish notation;  RPN
 calculator with postfix notation logic;  calculator with suffix notation logic;  calculator with reverse-Polish notation logic
 suffix notation;  postfix notation;  reverse Polish notation
 inverse fast Fourier transform
 shielding;  reverse clipping
 reciprocal lattice (crystallography)
 the eight unpardonable crimes in ancient Japanese law