beware

Inherited from Middle English bewar, ben ware (be on one's guard, be ware, be vigilant) affix from English be (about, on, around, all over, upon, over, at, away, off, across, concerning, completely, thoroughly, onto, by, unto, excessively, intensifier, fully, all about, out, extensively) + English ware (guard), be (about, on, around, all over, upon, over, at, away, off, across, concerning, completely, thoroughly, onto, by, unto, excessively, intensifier, fully, all about, out, extensively) + English aware (conscious, vigilant)root from Proto-Indo-European *wer- (heed, cover, defend, protect, burn, close, save, bend, turn, guard, rope, squirrel, envelop, boil, crook, notice, give heed, string, watch, speak, note, high, twist, perceive, tie, sense, blister, bond, blacken, shut, be wary, shelter, bind with a rope, highland, sketch an outline, become aware, take heed, stoat, make, cut, look out for, raised area, be aware, be watchful, tear, pay attention, scratch, observe, tuber, lump, work, be careful).

Proto-Indo-European