[ kuhn-spahyuhr ]
/ kənˈspaɪər /

verb (used without object), con·spired, con·spir·ing.

to agree together, especially secretly, to do something wrong, evil, or illegal: They conspired to kill the king.
to act or work together toward the same result or goal.

verb (used with object), con·spired, con·spir·ing.

to plot (something wrong, evil, or illegal).

Origin of conspire

1325–75; Middle English < Latin conspīrāre to act in harmony, conspire, equivalent to con- con- + spīrāre to breathe; see spirant, spirit
Related forms
Can be confusedconnive conspire

Synonym study

1. See plot. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for conspirer


/ (kənˈspaɪə) /

verb (when intr, sometimes foll by against)

to plan or agree on (a crime or harmful act) together in secret
(intr) to act together towards some end as if by designthe elements conspired to spoil our picnic
Derived Formsconspirer, nounconspiringly, adverb

Word Origin for conspire

C14: from Old French conspirer, from Latin conspīrāre to plot together, literally: to breathe together, from spīrāre to breathe
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for conspirer



late 14c., from Old French conspirer (14c.), from Latin conspirare "to agree, unite, plot," literally "to breathe together," from com- "together" (see com-) + spirare "to breathe" (see spirit (n.)). Or perhaps the notion is "to blow together" musical instruments, i.e., "To sound in unison." Related: Conspired; conspiring.

Online Etymology Dictionary, © 2010 Douglas Harper