or रम्भ् (mostly compound with a preposition; confer, compare √ग्रभ् and see √लभ् with which रभ् is connected) class1 Atmane-pada (Dha1tup. xxiii, 5) र्/अभते (mc. also that the rest of a word is to be suppliedति and Epic रम्भति, that the rest of a word is to be suppliedते; perfect tense रेभ्/ए fg-veda; also रारभे and 1. plural ररभ्म्/अ; Aorist /अरब्ध fg-veda; future रब्धा grammar; रप्स्यति MBh.; that the rest of a word is to be suppliedते ibidem etc.; infinitive mood रब्धुम् MBh.; Vedic or Veda र्/अभम्, र्/अभे; indeclinablepage and participle र्/अभ्य fg-veda etc.), to take hold of, grasp, clasp, embrace BhP. (अरभत् Hariv. 8106 wrong reading for आ*रभत्); to desire vehemently MW.; to act rashly ibidem (confer, compare रभस्, रभस): Passive voice रभ्यते Aorist अरम्भि, Pa1n2. 7-1, 63 : Causal रम्भयति, that the rest of a word is to be suppliedते Aorist अररम्भत् ibidem : Desiderative रिप्सते Pa1n2. 7-4, 54 : Intensive रारभ्यते, रारभीति, रारब्धि (as far as these forms really occur, they are only found after prepositions; confer, compare अन्व्-आ-, आ-, प्रा*-, व्य्-आ-, परि-, सं-रभ् etc.)
Source: Monier-Williams