Is it ensure, insure, or assure?
1630s, from French résorber or directly from Latin resorbere "to suck back," from re- "back, again" (see re-) + sorbere "to suck" (see absorb). Related: Resorbed; resorbing.
resorb re·sorb (rē-sôrb', -zôrb')v. re·sorbed, re·sorb·ing, re·sorbs
To absorb again.
To dissolve and assimilate such things as bone tissue.