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

Derived forms: underpinned, underpinning, underpins

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

Encyclopedia: Underpin

• outside caliper
• outside clinch
• outside door
• outside loop
• outside marriage
• outside mirror
• outsider
• outsider art
• outsize
• outsized
• outskirt
• outskirts
• outsmart
• outsole
• outsource
• outspan
• outspend
• outspoken
• outspokenly
• outspokenness
• outspread
• outstanding
• outstandingly
• outstare
• theme song