volvi

The base arrives last, and two pages have been waiting for it.Disvolviĝi landed at rank 2,065 and disvolvi at 2,595, and both had to admit in print that the root underneath them had no page yet. It does now. Volvi is that root: to wind, to roll up, to wrap something round something else. Thread round a finger, a map into a tube, a bandage round an arm.

The whole -volv- family, in one place. This is the payoff of learning the base late rather than never, because every member of the family is now readable without a dictionary:

• volvi - to roll something up. Transitive.
• volviĝi - to roll up, of itself. La papero volviĝis.
• volvaĵo - a roll, a coil, the thing that results.
• envolvi - to wrap up, to envelop. The parcel sense.
• ĉirkaŭvolvi - to wind around, emphasising the going-round.
• disvolvi - to unroll, to unfurl, and figuratively to develop a plan or an industry.
• disvolviĝi - to come unrolled, to unfold, to develop of its own accord.

Two roots, dis- and -iĝ-, and one base verb generate the lot. Learn volvi and you have retroactively earned six words you may already have been using.

The transitivity is the thing to get right. Volvi takes an object: you roll the map. If the thing rolls itself, add -iĝ- and drop the object. The same switch runs the whole family, and the igi and iĝi article is the fuller treatment. Do not reach for paki at 1,863 as a synonym: paki is to put things into a container for transport, and volvi is about the shape you make by turning something round on itself.