testify
/ˈtestɪfaɪ; `tɛstəˌfaɪ/ 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.