Note 238 — ACT I, SCENE 1.
Reading edition
Closely is privately, as in act iii. sc. 1—
"I'll entertain him here, meanwhile steal you Closely into the room."
Again, in "The Spanish Tragedy"—
"Boy, go, convoy this purse to Pedringano; Thou knowest the prison, closely give it him."
And again, ibid.—
"Wise men will take their opportunity Closely and safely, fitting things to time."
—Pegge.