From my accentless friends'AHD:

Appendix I
Indo-European Roots
ENTRY: reup-
Also reub-.
DEFINITION: To snatch.
Derivatives include bereave, rob, usurp, and bankrupt.
I. Basic form *reub-. rip1, from Flemish rippen, to rip, from Germanic *rupjan.
II. O-grade form *roup-. 1a. reave1, from Old English r afian, to plunder; b. bereave, from Old English ber afian, to take away (be-, bi-, intensive prefix; see ambhi); c. rover2, from Middle Dutch and Middle Low German roven, to rob. a–c all from Germanic *(bi-)raub n. 2a. rob, from Old French rober, to rob; b. rubato, from Italian rubare, to rob. Both a and b from a Romance borrowing from Germanic *raub n, to rob. 3. robe; garderobe, from Old French robe, robe (< “clothes taken as booty”), from Germanic *raub , booty. 4. Suffixed form *roup-tro-. loot, from Sanskrit loptram, booty. 5. ruble, from Old Russian rubiti, to chop, hew, from Slavic *rubje/a-.
III. Zero-grade form *rup-. 1. usurp, from Latin s rp re (< * su-rup-; sus, use, usage, from t , to use), originally “to interrupt the orderly acquisition of something by the act of using,” whence to take into use, usurp. 2. Nasalized zero-grade form *ru-m-p-. rout1, rupture; abrupt, bankrupt, corrupt, disrupt, erupt, interrupt, irrupt, rupicolous, from Latin rumpere, to break. (In Pokorny 2. reu- 868.)