" enters (into or upon) "

1: to take the first step in (a process or course of action);

  * e.g., " ... a series of counseling sessions intended to help young couples about to enter into the trials and tribulations of marriage "

•  Synonyms : 

•  begins,

•  commences,

•  embarks (on or upon),

•  falls (to),

•  gets off,

•  kicks off,

•  launches,

•  leads off,

•  opens,

•  starts,

•  strikes (into)

•  Antonyms : 

•  concludes,

•  ends,

•  finishes,

•  terminates