1. people who deliberately understate their abilities or performance to gain an advantage
Usage: informal; sports and gaming contexts
2. people who fill and place sandbags as flood protection or fortification
Usage: literal usage

Examples

• The golf tournament had strict rules against sandbaggers who might falsify their handicaps.
• Local sandbaggers worked through the night to protect the town from flooding.
• He suspected his poker opponents were sandbaggers pretending to be beginners.
• Volunteers became sandbaggers when the river threatened to overflow its banks.
• The chess club banned known sandbaggers from entering novice tournaments.
• Emergency sandbaggers rushed to reinforce the levee before the storm hit.