This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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auxiliary-verb. Archaic A second person singular present tense of can1.

v. Second-person singular simple present form of can.

"Authorised Version, 'If thou canst _believe_' -- throwing, as it were, the responsibility on the man -- but it is a quotation of the father's own word, 'If Thou _canst_,' as if He waved it aside with superb recognition of its utter unfitness to the present case."

shouldst    wouldst    didst    to    thou'lt    ’twould    couldst    may'st    priestlike    theyll