ETYMOLOGY
from Latin deblaterare transitive (to prate of, blab out), from de- + blaterare (to prate)
EXAMPLE
“… Robert Louis Stevenson, the traveler and author, writes: I conceived a great prejudice against missions in the South Seas, and I had no sooner come there than that prejudice was first reduced and then annihilated. Those who deblaterate against missions have only one thing to do, to come and see them on the spot. They will see a great deal of good done, and I believe, if they be honest persons, they will cease to complain of mission work and its effect. …”
From: What is a Christian and A Talk on Books,
By Henry Drummond, 1891
Thomas E. Watson “exposed”; an examination of his “Foreign missions exposed”.
Lexicophilia 