solder UK /ˈsɒl.də(ɹ)/US /ˈsɑd.ɚ/noun 2verb 2forms 3 noun2 •Any of various easily melted alloys, commonly of tin and lead, that are used to mend, coat, or join metal objects, usually small.I've had so little feeling that I've burned myself with liquid solder and watched my skin burn and not felt anything. — 1991 •(figurative) Circumstances or emotions that strongly bond things or persons together, by analogy to solder that joins metals.Friendship! Mysterious cement of the soul — and solder of society. — 1860 verb2 •To join items together, or to coat them with solder. •(figurative) To join things as if with solder. formssoldered · soldering · solders