begin definition
Starting and beginning. 1  be in the first flush of idiom. 2  become. 3  begin. branch out.  break into 1  sth. export.  get down to business 1  idiom. 2  ground. incipient. 3  initiator. 4  instate. 5  introduce. 6  kick. strike. swing into 7  action idiom. 8  touch 9  sth off. 10  train. 11  trigger.  wade in. weave.