1. people who are extremely conservative or resistant to change
Usage: informal; often derogatory
2. old turtles or other animals with moss growing on their shells or backs
Usage: literal sense

Examples

• The mossbacks in Congress opposed every reform proposal.
• Political mossbacks refused to embrace new technology.
• The old mossbacks at the club resisted changing the dress code.
• Some viewed the board members as stubborn mossbacks.
• The pond was home to several ancient mossbacks sunning themselves on logs.
• Fishermen often spotted the large mossbacks near the shore.