1. comparative form of tart; more sharp or acidic in taste
2. comparative form of tart; more sharp or cutting in manner or speech

Examples

• The green apples were much tarter than the red ones.
• This lemonade is tarter than I expected.
• Her response was even tarter than usual.
• The cranberries made the sauce tarter.
• His tarter remarks showed his growing impatience.
• The wine became tarter as it aged.