1. (noun) the soft belly or underside of an animal's body

• underbody

1. (noun) lower side

• bottom
• underside
• undersurface

2. (noun) the soft belly or underside of an animal's body

• abdomen
• belly
• stomach
• venter

3. (noun) the quality of being weak or unprotected

• soft spot
• weak part
• weak spot