Origins
The word "recommend" entered English around 1370 from Medieval Latin "recommandāre" (to commend to someone's attention, to entrust again), composed of "re-" (again, back) and "commendāre" (to entrust, to commit to someone's care, to praise), which itself is an intensified form of "mandāre" (to order, to commit to one's charge), from "manus" (hand) + "dare" (to give). The word is thus triply prefixed: re- + com- + manus + dare — to give-into-the-hand-together-again. The image is of something being passed from hand to hand with personal endorsement.
The layered etymology tells a story about trust. "Mandāre" places something in a hand. "Commendāre" places it with special emphasis and praise. "Recommandāre" places it again — re-entrusts it to a new recipient with the weight of the previous holder's experience. When you recommend a book, you are not just mentioning it; you are passing it from your hand to another's, with the implicit message: "I held this. It was good. I place it in your hands now."
The sibling relationship between "recommend" and its "mandāre" cousins reveals a spectrum of authority. "Command" places a task in the hand forcefully — it must be done. "Demand" places a claim in the hand insistently — it should be done. "Mandate" places a responsibility in the hand formally — it is entrusted. "Recommend" places a suggestion in the hand favorably — it is offered. Each word calibrates the force with which the hand-to-hand transfer is made.
Later History
In medicine, "recommended" dosages and treatments represent expert consensus — the collective judgment of physicians placed into the practitioner's hand as guidance. "The recommended daily allowance" of a nutrient is the amount that experts commend to the public's hands. These uses preserve the word's sense of informed, authoritative suggestion — not command but counsel.
The negative construction "not recommended" carries surprising force precisely because of the word's etymological weight. To say something is "not recommended" is not merely to express indifference — it is to actively withhold the hand, to refuse to pass something along. The recommendation is a positive act, and its absence is a meaningful choice.
From the dying Christ's commendation to Netflix algorithms, "recommend" traces the hand's journey from physical transfer to digital suggestion — always carrying the core meaning of one party placing something of value into another's care.