This is the verse translation, not a definition of the individual word.
When you are traveling through the land, there is no blame on you to shorten the prayer[1], if you fear that the disbelievers may harm you[2]. Indeed, the disbelievers are your open enemy.
Source
[1] Four rak‘ah prayers are shortened to two rak‘ahs.
[2] Fear is not a condition for this concession, merely travel.