To abbreviate is to shorten. Words are often abbreviated, like when we say sked instead of schedule.
Though we most often think about words being abbreviated — especially terms like OMG and LOL for "oh my God" and "laugh out loud" — lots of things can be abbreviated. You just have to shorten them. Sudden rain might abbreviate a baseball game. A bomb threat would abbreviate a school day. Anytime something is being shortened or cut, abbreviation is going on.