Definition of insidiate 

transitive verb

obsolete : to plot or scheme against : lie in wait for

intransitive verb

obsolete : to lie in ambush : plot, scheme

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Other Words from insidiate

insidiation noun plural -s obsolete
insidiator noun plural -s obsolete

History and Etymology for insidiate

Latin insidiatus, past participle of insidiari, from insidiae ambush, from insidēre to sit in

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to make faulty or ineffective

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