RELATED WORDS
PARAPHRASING
1) the shell on the back of a tortoise etc (carapace)
2) to write one's name on the back of (a cheque) (endorse)
3) something that reflects heat, light or sound, e.g. a piece of glass for reflecting light on the back of a bicycle (reflector)
with one leg on each side (of)
with a leg on either side