(anatomy) an internal intercostal muscle

(anatomy) an intercostal muscle

inside, within (physical location) / between, among / while, during, inside or within a span of time / (when used possessively) one's own, my, our

sooner or later / eventually / before long

(anatomy) a muscle

to forge, to train

To perform; to do; to conduct oneself; to carry out.

(anatomy, attributive) intercostality

(anatomy) an external intercostal muscle

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend