lean on them. Absent in bonobos. 3. sit and turn back Solicit grooming by approaching another, then turning back to potential groomer. See also Solicit grooming. Also in bonobos. See video. sit behind another Change position to groom back of companion. Also in bonobos. See video. S sit face to face Shift posture to sit en face, in social grooming or seeking to receive food. Also in bonobos. 2. See video. sit on In social play, one player sits on other player. Cf. step on in which smaller playmate rides on larger one lying supine. Cf. also trample. Category 38. See video. sit prone Slouch or bend forward, extend arms, and put palms on ground, often when being groomed. Also in bonobos. See video. sit sideways 171 sit