substitution (for someone else);  substitute;  stand-in;  scapegoat;  sacrifice
 substitute for a proper greeting (e.g. gift)
 taking over another's debt;  shouldering someone else's burden;  subrogation
 taking over (e.g. store or family's headship);  subrogation;  substitution of one person for another (usu. a creditor)
 (one acting as a) foster parent
 quick change;  quick transformation;  metamorphosis;  turning suddenly into
 alternately;  in turn;  one after the other
 a rise above a certain level (of a stock price, etc.)
 (Japanese) imperial succession
 periodical relief or replacement of workers