The slave kneels at the feet of the Freeperson and leans their body back, sitting upon their heels, with arms extended upward, crossed at the wrists, and head beneath them lowered in supplication. The Gorean word "Ko-lar," means the same as the Earth word "collar."

With the wrists uncrossed but holding a serving container, refreshments are typically served in this manner also. "Then, to my astonishment, the daughter of the Ubar Marlenus, daughter of the Ubar of Ar, knelt before me a simple warrior of Ko-ro-ba, and lowered her head, lifting and extending her arms , wrists crossed. It was, the submission of the captive female. Without raising her eyes from the ground, the daugher of the Ubar said in a clear , distinct voice, "I submit myself"... I was speechless for a moment, but then remembering that harsh Gorean custom required me either to accept the submission or slay the captive.
I took her wrist in my hands and said, " I accept your submission."
Tarnsman of Gor, p 93-94

She winced, her back bent painfully. "Do you wish me to submit to you now?" she begged. "Do so." said he. She fell to her knees before him and lifted her head to regard him " I will be your slave," she said. Then she knelt back on her heels, lowered her head, and lifted and extended her arms, wrist crossed , as though for binding. She was very beautiful. " I am your slave," she said "... Master."
Hunters of Gor , p.16