UNION JACK(noun)Did you mean?Synonyms RhymesAlso try..jackunionunionizeDefinitions There is 1 meaning of the phrase Union Jack. Union Jack - as a noun National flag of the united kingdom Synonyms (Exact Relations)union flagWord Variations & RelationsAnagramsStarts UStarts UNStarts UNIStarts UNIOEnds KEnds CKEnds ACKEnds JACKStarts U & ends KStarts UN & ends KStarts U & ends CKWords containing UNIONJACKA-Z Proximitiesuninvitedlyuninviting14uninvoked17uninvolved17union5 Union Jack unionidaeunionisation12unionisations13unionise8unionised10