Noun
ぜんそん
車が全損してしまった場合、修理代は保険で全額支払われないことが多いです。
If it turns out that the car is a total loss, many insurance companies will not pay the full repair cost.
An all loss is when you lose it all. It is a total loss.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.