Alexander Schmidt, Shakespeare Lexicon and Quotation Dictionary

Marry, an exclamation supposed to have been derived from the name of the Holy Virgin, used 1) to express indignant surprise: “I'll ascend the regal throne. M., God forbid!” R2 IV, 114. “Gloster is dead. M., God forfend!” H6B III, 2, 30. “I fear we shall ne'er win him to it. M., God forbid!” R3 III, 7, 81.
2) to affirm a wish or imprecation, in which case it is joined to amen: “God be wi' you, good Sir Topas. M., amen!” Tw. IV, 2, 109. “the Lord forbid! M., amen!” H8 III, 2, 54. “a plague of all cowards I say, and a vengeance too! m., and amen!” H4A II, 4, 128. “God forgive me, m. and amen!” Rom. IV, 5, 8.
3) to affirm any thing, == indeed, to be sure: “to each of you one fair and virtuous mistress fall, when Love please! m., to each, but one,” All's II, 3, 64. “good counsel, m.” R3 I, 3, 261. “m., yet the fire of rage is in him,” Cymb. I, 1, 76. cf. Meas. II, 1, 191. Meas. II, 1, 191 Err. III, 1, 15. Followed by and, by way of expressing a prompt and joyous assent: “you would all this time have proved there is no time for all things. M., and did, sir,” Err. II, 2, 103 (== and so indeed I did). “you bid me make it orderly and well. M., and did,” Shr. IV, 3, 96. “a virtue that was never seen in you. M., and I am glad of it,” H4A III, 1, 127. “go you and tell him so. M., and shall,” V, 2, 34. “I do beseech you send for some of them. M., and shall,” R3 III, 4, 36.
4) oftenest as an expletive particle, == why; imparting to the speech a slight tinge of contempt: “how do you bear with me? M., sir, the letter,” Gent. I, 1, 130. “how know you that I am in love? M., by these marks,” II, 1, 18. “how painted? M., so painted,” II, 1, 18 II, 5, 13. III, 1, 295. IV, 2, 28. IV, 2, 28 IV, 4, 49. Meas. I, 2, 64. II, 1, 80. Err. II, 2, 52. LLL II, 84. Mids. I, 2, 11. V, 365. Merch. II, 2, 44. R2 I, 4, 16. H6A II, 3, 31. H6B II, 1, 39. R3 II, 2, 124. Rom. I, 3, 63. Hml. III, 2, 247. Lr. IV, 2, 68 etc. m., come up == you mistake your business! you will find your match! Rom. II, 5, 64. Per. IV, 6, 159. m. trap == you are caught (Nares): Wiv. I, 1, 170. Followed by an inversion of the subject in answers: “wilt thou be pleased? M., will I,” Tp. III, 2, 46. “you mean to whip the dog? Ay, m., do I,” Gent. IV, 4, 28. “were they his men? m., were they,” Wiv. II, 1, 185. “does he lie at the Garter? Ay, m., does he,” Wiv. II, 1, 185 IV, 5, 29. LLL I, 1, 126. Mids. III, 1, 92. As I, 1, 128. All's III, 5, 40. Wint. III, 3, 140. H4B III, 2, 104. R3 I, 3, 98. H8 I, 1, 97. Tit. IV, 1, 122. Caes. I, 2, 229. Hml. I, 4, 13. Oth. III, 1, 7.