O, train me not, sweet mermaid, with thy note, To drown me in thy sister’s flood of tears: Sing, siren, for thyself, and I will dote; Spread o’er the silver waves thy golden hairs, And as a bed I’ll take thee, and there lie; And, in that glorious supposition, think He gains by death that hath such means to die:— Let love, being light, be drowned if she sink!
There are no more uses of "supposition" in the play.
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It is a foolish supposition.
She paints a vivid picture, but we must remember it is all mere supposition.