The idiom straight as an arrow means perfectly straight or direct, with no curves or bends.
The expression comes from the way arrows fly when they are shot from a bow. A well shot arrow travels quickly and directly toward its target in a straight line, which made it a natural comparison for anything very straight.
The expression comes from the way arrows fly when they are shot from a bow. A well shot arrow travels quickly and directly toward its target in a straight line, which made it a natural comparison for anything very straight.
The long country road ran straight as an arrow across the flat fields.