1. a wedge-shaped piece or pin used to fasten or secure parts of a machine or structure
Usage: mechanical
2. a tenant farmer who works land in exchange for a cottage and small plot
Usage: historical; British

Examples

• The mechanic inserted a cotter pin to secure the wheel assembly.
• Remove the cotter before attempting to disassemble the joint.
• The old cotter lived in a small stone cottage on the estate.
• Many cotters struggled to make ends meet during harsh winters.
• The cotter split when too much force was applied.
• Historical records show that cotters often paid rent through labor.