Synonyms for Get under way:

• v.

  •begin (verb)
  • commence,
  • crop up,
  • start,
  • set,
  • get going,
  • sail,
  • kick off,
  • arise,
  • originate,
  • emerge.
  •inaugurate (verb)
  • institute,
  • introduce,
  • break the ice,
  • Instate,
  • open,
  • usher in,
  • set in motion,
  • initiate,
  • set up,
  • launch.
  •initiate (verb)
  • inaugurate,
  • begin,
  • trigger.
  •proceed (verb)
  • march,
  • push on,
  • move out,
  • continue,
  • advance,
  • press on,
  • go on,
  • progress.
  •send (verb)
  • put out.
  •speed (verb)
  • get moving.
  •start (verb)
  • establish,
  • make a beginning,
  • instigate,
  • depart,
  • activate,
  • sally forth,
  • enter upon,
  • set out.

• Other synonyms:

  •sail
  • make headway.

Antonyms for Get under way:

• v.

  • begin
    disappear, end, leave, shrink, die, conclude, consummate, complete, finish, stop, hide.
  • inaugurate
    close, adjourn, retract, cease, uninstall.
  • initiate
    halt, block, ignore, reject, terminate, expel, neglect.
  • proceed
    discontinue, fail, yield, wait, retreat, stay, retrogress, decrease, return, lose.
  • sail
    remain, go, land, walk.
  • send
    hold, displease, keep, keep quiet, hinder, refrain, take, retain, conceal, gather, withhold, receive, suppress.
  • speed
    delay, dissuade, retard, slow, obstruct, rest, prevent, check, procrastinate, hurt.
  • start
    dull, calm, destroy, ruin.