[calcowgirl]

bash

PRONUNCIATION:	bsh
VERB:	Inflected forms: bashed, bash·ing, bash·es
TRANSITIVE VERB:	1. To strike with a heavy, crushing blow: The thug bashed the hood of the car with a sledgehammer. 2. To beat or assault severely: The police arrested the men who bashed an immigrant in the park. 3. Informal To criticize (another) harshly, accusatorially, and threateningly: “He bashed the . . . government unmercifully over the . . . spy affair” (Lally Weymouth).
INTRANSITIVE VERB:	Informal To engage in harsh, accusatory, threatening criticism.
NOUN:	1. Informal A heavy, crushing blow. 2. Slang A celebration; a party.
ETYMOLOGY:	Origin unknown.
OTHER FORMS:	basher —NOUN

[ElkGroveDan]

Found the etymolgy of "Bash"

bash "to strike violently," 1641, perhaps of Scand. origin (cf. Swed. basa "to baste, whip, flog, lash," Da. baske "to beat, strike, cudgel"), from O.N. *basca "to strike;" or the whole group may be independently derived and echoic. Fig. sense of "abuse verbally or in writing" is from 1948. On a bash "on a drunken spree" is slang from 1901, which gave the word its sense of "party."