unˈdersong noun (archaic)

1. A burden or refrain, etc of song or of sound
2. An undertone less pleasant in quality (figurative)

• training
• Training Agency
• training college
• training colleges
• training pants
• trainings
• training ship
• training ships
• training shoe
• training wheels
• trainless
• train mile
• train miles
• train-oil
• trains
• trainspotter
• trainspotters
• trainspotting
• Train à Grande Vitesse
• traipse
• traipsed
• traipses
• traipsing
• traipsings
• trait