eat into (something)

eat into (something)

1. To take away or use up a large amount of resources over a certain period of time. Changing voter demographics have been eating into the party's traditionally strong hold on state politics. Don't eat into your savings to pay for that fancy new smart phone.
2. To erode, corrode, or slowly consume something. Rising acidity in the ocean has caused it to start eating into the hulls of our ships.
See also: eat