'To pray in aid' definitions:

Definition of 'To pray in aid'

From: GCIDE

Pray \Pray\, v. t.
1. To address earnest request to; to supplicate; to entreat; to implore; to beseech. [1913 Webster]
And as this earl was preyed, so did he. --Chaucer. [1913 Webster]
We pray you . . . by ye reconciled to God. --2 Cor. v. 20. [1913 Webster]
2. To ask earnestly for; to seek to obtain by supplication; to entreat for. [1913 Webster]
I know not how to pray your patience. --Shak. [1913 Webster]
3. To effect or accomplish by praying; as, to pray a soul out of purgatory. --Milman. [1913 Webster]
To pray in aid. (Law) (a) To call in as a helper one who has an interest in the cause. --Bacon. (b) A phrase often used to signify claiming the benefit of an argument. See under Aid. --Mozley & W. [1913 Webster]