E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Flattery, adulation. A play is intended between solder (pronounced sawder) and sawder, a compound of saw (a saying). Soft solder, a composition of tin and lead, is used for soldering zinc, lead, and tin; hard solder for brass, etc. (French, soudure, Latin, soldus.)