On+a+horse's+back
131To put one's back up — Back Back (b[a^]k), n. [AS. b[ae]c, bac; akin to Icel., Sw., & LG. bak, Dan. bag; cf. OHG. bahho ham, Skr. bhaj to turn, OSlav. b[=e]g[u^] flight. Cf. {Bacon}.] 1. In human beings, the hinder part of the body, extending from the neck to the end… …
132To see the back of — Back Back (b[a^]k), n. [AS. b[ae]c, bac; akin to Icel., Sw., & LG. bak, Dan. bag; cf. OHG. bahho ham, Skr. bhaj to turn, OSlav. b[=e]g[u^] flight. Cf. {Bacon}.] 1. In human beings, the hinder part of the body, extending from the neck to the end… …