bash (n.) Look up bash at Dictionary.com
"a heavy blow," 1805, from bash (v.). Meaning "an attempt" is attested by 1948. On a bash "on a drunken spree" is slang from 1901, which gave the word its sense of "party."
bash (v.) Look up bash at Dictionary.com
"to strike violently," 1640s, perhaps of Scandinavian origin, from Old Norse *basca "to strike" (cognates: Swedish basa "to baste, whip, flog, lash," Danish baske "to beat, strike, cudgel"); or the whole group might be independently derived and echoic. Figurative sense of "abuse verbally or in writing" is from 1948. Related: Bashed; bashing.