(music) Providing support for the main performer.

(phonetics) Quality of being a back vowel.

Third-person singular simple present indicative form of back into

Alternative spelling of backwater

(nautical) To reverse the action of the oars, paddles, or propeller, so as to force the boat or ship backward.

Alternative form of backbite

(aerial freestyle skiing) a faulty landing, whereby the skier rotates backwards around the knee-joint and hits the snow of the landing slope with their back and head, before rising off the snow back into position with their skis underneath them.

(music) when bass strings are slapped rather plucked individually.

(transitive) To reverse (a vehicle) from a confined space. / (intransitive) To withdraw from something one has agreed to do. / (transitive) To dare (someone) to not withdraw from a challenge.

(American football) An offensive back whose primary job is to be the ballcarrier.