What is the meaning of Basher?

One who bashes something, figuratively or literally.

1. Before the days of pneumatic rivet guns, the member of a riveting team who hammered the rivet to upset the bucktail to form the field head (see rivet).

Before the days of pneumatic rivet guns, the member of a riveting team who hammered the rivet to upset the bucktail to form the field head (see rivet).

One who engages in gratuitous physical or verbal attacks on a group or type of people.

A trainspotter, especially one who likes to travel on specific trains or trainlines.

A rainproof sheet for sleeping under.

A shelter built from improvised materials by a homeless person.

A kind of small floodlight.

Source: wiktionary.org