Meanings

backstroke (swimming)

spine

back pain

to carry on one's back

tall (of a person)

apostasy

standing on tiptoe and stretching one's back to make oneself taller

back to back

one's husband

pretending to obey but secretly betraying (someone)

back door

back of a sword

disobeying

revolting

estrangement

back and front

backstroke (swimming)

Fosbury flop (high jump technique)

rear

giving up and turning back