to be or go straight and level, and so to be right or pleasing; also to make a path straight, smooth, or direct
The picture underneath this word is a straight, level line. Something can move along that line (go straight ahead), or a person can create it (make a road smooth and direct), or a thing can simply measure up to it (be straight, and therefore right).
From that single image the word fans out in two directions. In the plain, physical sense it describes cattle keeping to the road, a builder leveling ground, or a prophet calling for a highway to be cleared. In the figurative sense the same straightness becomes a picture of approval: when something is straight in a person's eyes it strikes them as right, fitting, and acceptable, and so it pleases them.
Because English has to choose a different word for each of these shades (go straight, make level, direct, please, be upright), no single translation carries the whole range. The connecting thread is always the same: what is straight is what is right.