maincause
nounUK /ˈmeɪn.kɔːz/
US /ˈmeɪn.kɔːz/
The maincause is the biggest reason why something happens.
The maincause of the fire was a broken wire.
OTHER MEANINGS
2. The most important factor in a problem or situation.
Scientists studied the maincause of the disease.
3. The leading origin of an event or result.
Bad weather was the maincause of the delay.
4. The central reason something goes wrong.
They found the maincause of the machine's failure.