Meanings of rapid inroads in English

The heartache, that terrible malady of the soul, had made rapid inroads.

Disease was making rapid inroads upon her constitution, and she was aware of it.

And it was important to counter MySpace, which was making rapid inroads in high schools.

Still it was evident that age and sickness were making rapid inroads on his strength.

Pleurisy came on, and made such rapid inroads upon his strength that in a very few days his recovery was pronounced impossible.

Nintendo has been battling competition from traditional rivals Microsoft and Sony while Apple and Google are also making rapid inroads into the casual gaming market.