マンガイチ
Meanings
Adverb
1. (if) by some chance; by some possibility; in the unlikely event that; (lit.) 10000 to 1
In the unlikely event that someone is inside, they might come bursting out.
Noun
2. (unlikely event of) emergency; the worst(-case scenario)
It is important to prepare for the worst-case scenario.
Pitch accent
マ
ンガイチ
Composed of
10,000; ten thousand; myriad
one; 1; best; first; foremost; beginning; start
Examples (9 in total)
In case of emergency, I'll take care of it.
If he should come here, I will let you know at once.
Just in case, you should get auto insurance.