1. The underlying support or justification of something

1. Support from beneath 
2. Support with evidence or authority or make more certain or confirm
   - corroborate, bear out, support

Derived forms: underpinnings

Type of: agree, check, correspond, fit, gibe, hold, hold up, jibe, match, support, sustain, tally

Encyclopedia: Underpin

• resting-place
• restitute
• restitution
• restive
• restively
• restiveness
• restless
• restless legs
• restless legs syndrome
• restlessly
• restlessness
• restock
• restorable
• restoral
• restoration
• restorative
• restore
• restorer
• Restoril
• restrain
• restrainable
• restrained
• restrainer
• restraint
• restraint of trade