Rock or other material that contains valuable or utilitarian materials; primarily a rock containing metals or gems for which it is typically mined and processed.
Any of various easily-melted alloys, commonly of tin and lead, that are used to mend, coat, or join metal objects, usually small.
Figuratively, circumstances or emotions that strongly bond things or persons together in analogy to solder that joins metals.
to join things as if with solder.
to join items together, or to coat them with solder