This definition from the PTS dictionary is interesting, particularly when adding the second definition to the mix:
ārambha
1. attempt, effort, inception of energy (cp. Dhs trsl. 15 & K. S. p. 318
2. support, ground object, thing Ne.70 sq., Ne.107; an˚; unsupported, independent Snp.743 (= nibbāna Snp-a.507). Cp. also nirambha upārambha, sārambha.
Perhaps the exertion to acquire/retain those things that are supports for consciousness? SN 12.38 seems to be relevant here, don't you think?
At Savatthī. “Bhikkhus, what one intends, and what one plans, and whatever one has a tendency towards: this becomes a basis for the maintenance of consciousness. When there is a basis there is a support for the establishing of consciousness. When consciousness is established and has come to growth, there is the production of future renewed existence. When there is the production of future renewed existence, future birth, aging-and-death, sorrow, lamentation, pain, displeasure, and despair come to be. Such is the origin of this whole mass of suffering.
“If, bhikkhus, one does not intend, and one does not plan, but one still has a tendency towards something, this becomes a basis for the maintenance of consciousness. When there is a basis, there is a support for the establishing of consciousness…. Such is the origin of this whole mass of suffering.
“But, bhikkhus, when one does not intend, and one does not plan, and one does not have a tendency towards anything, no basis exists for the maintenance of consciousness. When there is no basis, there is no support for the establishing of consciousness. When consciousness is unestablished and does not come to growth, there is no production of future renewed existence. When there is no production of future renewed existence, future birth, aging-and-death, sorrow, lamentation, pain, displeasure, and despair cease. Such is the cessation of this whole mass of suffering.”
“But, Gotamī, when you know of certain things: ‘These things lead to dispassion, not to passion; to detachment, not to attachment; to diminution, not to accumulation; to having few wishes, not to having many wishes; to contentment, not to discontent; to seclusion, not to socializing; to the arousing of energy, not to indolence; to simple living, not to luxurious living’ – of such things you can be certain: ‘This is the Dhamma; this is the Discipline; this is the Master’s Teaching.’”