This is the 1001st most frequent Russian word.
боевой
Combat, military, or fighting.
In this sentence, 'боевой дух' refers to the spirited motivation and determination associated with combat situations, thus emphasizing a figurative meaning.
Этот солдат проявил боевой дух на поле боя.
This soldier exhibited combat spirit on the battlefield.
Here, 'боевой товарищ' implies a loyal and supportive companion with a resolute attitude, showing a more metaphorical use of 'боевой'.
У нас в классе есть боевой товарищ, который всегда заступается за своих.
In our class, there is a combative comrade who always stands up for their own.
In this case, 'боевая техника' denotes military equipment designed for use in combat, illustrating a literal application of 'боевой'.