These two females did afterwards depone that Mr. Willet in his consternation uttered but one word, and called that up the stairs in a stentorian voice, six distinct times.
-- Charles Dickens, Barnaby Rudge
I cannot depone positively to the exact proportion of his waking or of his sleeping dreams that was of their weaving.
-- Edmund Quincy, The Haunted Adjutant
Origin:
In Latin, dēpōnere meant "to put aside." In Medieval Latin it came to mean "to testify" and came directly into English.