1. A frame with two short handles at each end, used for carrying a load (wheel-less, and carried between two people); a wheelbarrow; a pushcart.
2. A mound of earth or stones over a grave, a tumulus; a mound or hill.
3. A castrated male pig.
All three uses of the word have part of their origin in Old English:
-- Definition 1 originated in the 1300s and comes from bearwe (to bear, to carry), same as the verb 'to bear'.
-- Definition 2 comes from Old English beorge (mountain, hill, mound); the definition of 'mound' or 'hill' (without a grave) is obsolete except in place names.
-- Definition 3 comes from Old English bearge (which has something to do with castration or cutting); this use of the word originated before 1000.
There are many other less common (or archaic) uses of the word:
-- barrow or barrow-coat: a long flannel garment for infants, wrapped around the body under the arms and turned up and pinned about the feet; a pinning blanket.
-- A burrow or warren.
-- (salt works) A wicker case in which salt is put to drain.
-- barrow or skate-barrow: the egg-case of a skate or ray.
-- (mining) A heap of rubbish or refuse.