Etymology
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bash (v.)

"to strike violently," 1640s, perhaps of Scandinavian origin, from Old Norse *basca "to strike" (cognate with or otherwise related to 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.

bash (n.)

"a heavy blow," 1805, from bash (v.). Meaning "an attempt" is attested by 1945. On a bash "on a drunken spree" is slang from 1901, which gave the word its sense of "a wild party."

updated on April 15, 2018

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Definitions of bash from WordNet
1
bash (n.)
a vigorous blow;
he took a bash right in his face
Synonyms: knock / bang / smash / belt
bash (n.)
an uproarious party;
Synonyms: do / brawl
2
bash (v.)
hit hard;
Synonyms: sock / bop / whop / whap / bonk
From wordnet.princeton.edu, not affiliated with etymonline.