נימוק

נִימּוּק, נִמּ׳m. (contr. of נעמוק; עָמַק) depth, penetration. Ab. dR. N. ch. XVIII; Gitt.67a ר׳ יוסי נִימּוּקוֹ עמו gave to R. Jose the surname, ‘His depth is with him, i. e. he has deep reasons for whatever be says. Ib. אלמלא ראיתו נ׳ עמו if thou hadst seen him, (thou wouldst have seen) his depth was Erub.51a. Bekh.37a מחו דתימא נ׳ עמו you might have thought, we must adopt R. Joses opinion because he is known to have deep reasons.