auxiliary verb and verb Archaic.
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Words nearby couldst
How to use couldst in a sentence
Nor hast thou ever known, Aspasia,Or couldst thou comprehend the thoughts that onceThou didst inspire in me.The Poems of Giacomo Leopardi|Giacomo Leopardi
God answered him, "I have suffered him these hundred years, although he dishonored me; and couldst not thou endure him one night?"Library Notes|A. P. Russell
“I thought thou couldst shoot true, Shumilana,” whispers Mandevu.Forging the Blades|Bertram Mitford
What knowest thou of this, for I think thou couldst not have been far from this place at sundown yesterday?A Frontier Mystery|Bertram Mitford
A right Conjurer might I name thee, couldst thou conjure back into these wooden tools the divine virtue they once held.Sartor Resartus|Thomas Carlyle