1) Confab 2) Confabulate 3) Confer 4) Confer secretly 5) Conspire 6) Consult 7) To coax 8) To confer secretly 9) To conspire 10) To flatter 11) To plot mischief 12) To simulate belief 13) To talk privately or secretly 
to converse confidentially; to conspire with
• (v. i.) To talk or confer secretly and confidentially; to converse, especially with evil intentions; to plot mischief.
Col·logue' intransitive verb [ Confer Latin colloqui and English dialogue . Confer Collocution .] To talk or confer secretly and confidentially; to converse, especially with evil intentions; to plot mischief. [ Archaic or Colloq.] « Pray go in; and, sister, salve the matter, ...
[v] - confer secretly
verb confer secretly
to confer secretly. · to plot mischief; conspire.