How to sign: any of numerous marine mammals that come on shore to breed; chiefly of cold regions
Categories: pinnatiped, pinniped, pinniped mammal
Within this category: crabeater seal, eared seal, earless seal
How to sign: make tight; secure against leakage
"seal the windows";
Similiar / Same: seal off
Within this category: caulk, pack, reseal, waterproof