Second-person singular present simple form of open(verb)
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Use "openest" in a sentence
"I have heard of Thee, and of Thy healing; that Thou dost not use medicines or roots, but by Thy word openest (the eyes) of the blind, makest the lame to walk, cleansest the lepers, makest the deaf to hear; how by Thy word"
"But of all wild resting-places I have known, the openest are the most delightful."
"Thou openest thine hand, and satisfiest the desire of every living thing."