It was used as bash = party. Example: “He had a big bash for his 18th birthday.” This shows “bash” means celebration or gathering.It was used as bash = hitting someone. Example: “He bashed that man’s face in.” Here, “bash” means to strike hard or attack physically.It was used as bash = criticism. Example: “They bashed the other girl’s comment on YouTube.” In this case, “bash” means to strongly criticize or insult someone’s opinion.