seal of approval

: any of numerous carnivorous marine mammals (families Phocidae and Otariidae) that live chiefly in cold regions and have limbs modified into webbed flippers adapted primarily to swimming

: the pelt of a fur seal

: leather made from the skin of a seal

: to hunt seals

: something that confirms, ratifies, or makes secure : guarantee, assurance

: a device with a cut or raised emblem, symbol, or word used especially to certify a signature or authenticate a document

: a medallion or ring face bearing such a device incised so that it can be impressed on wax or moist clay

: to confirm or make secure by or as if by a seal

: to solemnize (something, such as a marriage) for eternity by a Mormon rite

: to set or affix an authenticating seal to

: an act or instance of approving something : approbation