causal. To cause to waver; to wave to and fro; to set in waving or fluttering motion; to render unsteady or unsteadfast. Obsolete.

To change the condition or direction of; to alter, cause to deviate or waver; to pervert (law). Obsolete.

figurative. with object a person (in faith, resolution, etc.) or his faith, purpose, testimony, etc.

figurative. To shake, unsettle, cause to waver or falter (a person's faith, opinion, purpose, etc.).

transitive. colloquial (originally U.S.). With up. To make more amenable or cooperative; to undermine the resistance of.