TN Gen18:15 :לא ארום גחכת‏ : not so; you did laugh
See the entire entry for ˀrwm conj. because, since

TN Gen18:15 :וכדבת שרה למימר לא גח<כ>ת‏ : Sarah lied saying "I did not laugh"
See the entire entry for gḥk vb. to laugh; D to play

TN Gen18:15var. :לא גח<כ>ת"דחכית"‏ :
See the entire entry for dḥk vb. to laugh