to succeed;  to relieve;  to take the place of;  to substitute for;  to be exchanged;  to change (places with)
 another helping;  second helping;  seconds;  command to have dog place its second paw in one's hand
 substitute;  replacement;  stand-in;  proxy;  compensation;  exchange
 to change places;  to relieve one another;  to replace someone
 substitution;  replacement;  shifting;  change
 turning point;  change;  transition; (arch.)  point of difference
 to be replaced with new growth
 to fall out and be replaced;  to shed;  to moult (molt)
 upcoming program;  upcoming programme
 picture that changes as one folds or cuts it (e.g. from a picture of a smiling man to a man with a frown)