1. a large container for holding liquid or gas
2. a heavily armored military vehicle with guns and tracks
3. a large artificial pool for swimming

1. to fail completely or perform very poorly
Usage: informal
2. to deliberately lose a game or competition
Usage: informal

Examples

• The gas tank was nearly empty.
• The army deployed tanks to the front lines.
• She swam laps in the community tank.
• The movie tanked at the box office.
• The water tank holds 500 gallons.
• His performance tanked during the final exam.
• The fish tank needs cleaning.