What is the meaning of In_the_field?

Actively engaged in fighting or dealing with the enemy; in battle or on maneuvers.

Away from the office, classroom, or laboratory; working with people or things in their natural environment.

In a real-world setting, as opposed to the controlled conditions of a laboratory or the hypothesized parameters of a theoretical approach.

Used other than figuratively or idiomatically: see in, field.

Source: wiktionary.org