transitive. To plan by conspiracy; to conspire.

For an evil or unlawful purpose. Cf. confederacy, n. 1b.

transitive. To combine in planning or plotting (some act, usually criminal): to concert covertly.

In a bad sense: To conspire, plot. Obsolete.

transitive. To conspire or scheme in secret to do something. Obsolete. rare.

transitive. To plan by compact, conspire.

transitive. To conspire.