rub genitals to substrate Female rubs genitals against substrate such as ground or tree trunk. 9. See video. rub hand or foot Corp et al. Hand-rubbing. Rub hand or foot against branch of tree, stalk of shrub, rock, or ground when eating juicy fruit of lemon or sticky fruit such as Saba. After touching feces or other dirty object, immediately rub soiled hand or foot against ground. Cf. brush away from branch. 7. See video. rub hand with hand Rub hands together briskly and repeatedly, e.g. after removal of ectoparasite from body. 7. See video. rub muzzle Corp et al. Muzzle-rub. Rub muzzle stained with fruit juice against shrub, grass stalk, slender vine, bark of tree, or stone, to wipe off mess. Differs from wipe with detached object