Foil is a related term of circumvent.

As verbs the difference between foil and circumvent

is that foil is to prevent (something) from being accomplished or foil can be (mathematics) to multiply two binomials together or foil can be (obsolete) to defile; to soil while circumvent is to avoid or get around something; to bypass.

As a noun foil

is a very thin sheet of metal or foil can be failure when on the point of attainment; defeat; frustration; miscarriage or foil can be (hunting) the track of an animal.