What is the meaning of Shirk?

To avoid, especially a duty, responsibility, etc.; to stay away from.

To evade an obligation; to avoid the performance of duty, as by running away.

To procure by petty fraud and trickery; to obtain by mean solicitation.

One who shirks, who avoids a duty or responsibility.

The unforgivable sin of association (of something with God).

Source: wiktionary.org