/'testɪfaɪ; `tɛstə,faɪ/
v (pt, pp -fied)
1 [I, Ipr, Tf]~ (to sth); ~ (against/in favour of sb) give evidence; declare as a witness, esp in court 提供证据; 作证（尤指出庭）
*summoned to testify in court 被传出庭作证
* The teacher testified to the boy's honesty. 老师证明那男孩很诚实.
* Two witnesses testified against her and one in her favour. 有两个证人的证词对她不利, 另一个人的对她 有利.
* He testified under oath that he had not been at the scene of the crime. 他宣誓称自己当时不在犯罪现场.
2 [Ipr, Tn] ~ (to) sth (fml 文) be evidence of sth 作为某事的证据; 证明
*tears that testified (to) her grief 可见她悲伤的眼泪.

v past tense and past participletestifiedpresent participletestifyingthird person singulartestifies
[Date: 1300-1400; Language: Latin;Origin: testificari, from testis 'witness']
[I and T]
to make a formal statement of what is true, especially in a court of law
　Mr Molto has agreed to testify at the trial.
testify against
　Later, the witness who had testified against Muawad withdrew his allegation.
[I and T]written
to show clearly that something is the case
testify to
　The empty shops in the high street testify to the depth of the recession.
testify that
　The full ashtrays testify that smoking hasn't been stubbed out.
　Can you testify that you saw the defendant at the scene of the crime?
[I]AmE
to stand up and tell people about how God has helped you in your life