The back azimuth is the opposite direction of the forward azimuth.

The surveyors recorded the back azimuths of the landmarks.

The hackers back doored the company's network and stole sensitive data.

He falls back on his savings when he needs extra money.

He fell back on his old habits.

She has fallen back on her old habits.

She is falling back on her old habits.

She had a swept-back hairstyle that looked elegant.

The back rank is the row of squares closest to a player's starting position in chess.

She loves to throw it back on the dance floor.