Sentence:  Hamlet: / ...There is a play to-night before the king; / One scene of it comes near the circumstance / Which I have told thee of my father's death: / I prithee, when thou seest that act afoot, / Even with the very comment of thy soul / Observe mine uncle: if his occulted guilt / Do not itself <WSD>unkennel</WSD> in one speech, / It is a damned ghost that we have seen, / And my imaginations are as foul / As Vulcan's stithy. Give him heedful note; / For I mine eyes will rivet to his face, / And after we will both our judgments join / In censure of his seeming. 
Meaning of the word marked with <WSD> tags:  To reveal, uncover or unfold.