Occur

verb

1. To occur by chance
2. To come into being or occur as an event, process, or result

   "mistakes will happen"

3. To do, encounter, or attain something by or as if by chance

   "I happen to know the answer"

4. To meet or discover something by chance

   "happened upon a system that worked"

5. To come or go casually make a chance appearance

   "he might happen by at any time"

6. To come especially by way of injury or harm

   "I promise nothing will happen to you"

idiom

1. To come to or by a place by chance

   "He was about to leave when his old girlfriend happened by."

phrasal verb

1. To enter (a place) by chance

   "She happened into the room just as the music started."

phrasal verb

1. To find or meet (someone or something) by chance

   "She happened on a little cottage in the woods."

phrasal verb

1. To affect or involve (someone or something) as the result of an event or action

   "An odd thing happened to me on my way to the office last week."

noun

1. A sudden calamitous event bringing great damage, loss, or destruction

   "natural disasters"

2. Someone or something that is extremely unsuccessful

   "The wedding reception was a complete disaster."

3. Someone or something that has a very bad effect or result

   "The new coach was a disaster for the team."

4. Someone who is in a very agitated emotional state wreck

   ""… I cried like a baby and kind of had a breakdown. I really just lost it. The weekend after we wrapped, I was a disaster. …""

5. Someone or something that is in a very disordered state or condition mess

   "The house is a complete disaster."

6. An unfavorable aspect see aspect of a planet or star