testify

 
Pronunciation: /ˈtɛstɪfʌɪ/

verb (testifies, testifying, testified)

[no object]
  • give evidence as a witness in a law court: he testified against his own commander [with clause]: two guards testified that he was one of the assailants
  • serve as evidence or proof that something exists or is the case: the bleak lines testify to inner torment

Derivatives

testifier

noun

Origin:

late Middle English: from Latin testificari, from testis 'a witness'