solder

Short definition from Wiktionary

Noun

1. 1
   Any of various easily-melted alloys, commonly of tin and lead, that are used to mend, coat, or join metal objects, usually small.
2. 2
   Figuratively, circumstances or emotions that strongly bond things or persons together in analogy to solder that joins metals.

Verb

1. 1
   to join items together, or to coat them with solder
2. 2
   to join things as if with solder.