vouch

verb

1.
give personal assurance; guarantee
Agent:
voucher
Derived from:
voucher
2.
give surety or assume responsibility
ice bond guarantee
Agent:
voucher
Derived from:
voucher
3.
summon (a vouchee) into court to warrant or defend a title
Undergoer:
vouchee
Derived from:
vouchee
4.
give supporting evidence