In phrases, TO BEGIN TO ONE = to pledge a person first in drinking; TO BEGIN ON ONE = to attack; to assault.

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  1628.  EARLE, Microcosmographie, lxxvi. That is kind o’er his beer, and protests he loves you, and BEGINS TO YOU again.

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  1651.  CARTWRIGHT, The Siedge.

                        You shall have
This lord come profer you his daughter, this
Burgesse his wife, and that unskilfull youth
Pray you BEGIN TO HIM in ’s trembling bride.

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  d. 1656.  JOSEPH HALL, Works, V. 171. Can ye drink of that bitter cup wherein I shall BEGIN TO YOU?

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  1715.  BURNET, History of My Own Times, II, 117. At Sandcroft’s Consecration dinner, he BEGAN a health TO the confusion of all that were not for a war with France.

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  1825.  M. M. SHERWOOD, Joan; or, Trustworthy, Part II. All the company BEGAN UPON her, and bade her mind her own affairs, and not think of housekeepering it over them.

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