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soap (n.)

Old English sape "soap, salve" (originally a reddish hair dye used by Germanic warriors to give a frightening appearance), from Proto-Germanic *saipon "dripping thing, resin" (source also of Middle Low German sepe, West Frisian sjippe, Dutch zeep, Old High German seiffa, German seife "soap," Old High German seifar "foam," Old English sipian "to drip"), from PIE *soi-bon-, from root *seib- "to pour out, drip, trickle" (source also of Latin sebum "tallow, suet, grease").

Romans and Greeks used oil to clean skin; the Romance words for "soap" (Italian sapone, French savon, Spanish jabon) are from Late Latin sapo "pomade for coloring the hair" (first mentioned in Pliny), which is a Germanic loan-word, as is Finnish saippua. The meaning "flattery" is recorded from 1853.

Soap opera is recorded from 1939, as a disparaging reference to daytime radio dramas sponsored by soap manufacturers. 

soap (v.)

1580s, from soap (n.). Related: Soaped; soaping.

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Definitions of soap from WordNet
1
soap (n.)
a cleansing agent made from the salts of vegetable or animal fats;
soap (n.)
money offered as a bribe;
soap (n.)
street names for gamma hydroxybutyrate;
Synonyms: scoop / max / liquid ecstasy / grievous bodily harm / goop / Georgia home boy / easy lay
2
soap (v.)
rub soap all over, usually with the purpose of cleaning;
Synonyms: lather
From wordnet.princeton.edu