n. & v.
--n. a clumsy or foolish mistake, esp. an important one.
--v.
1. intr. make a blunder; act clumsily or ineptly.
2 tr. deal incompetently with; mismanage.
3 intr. move about blindly or clumsily; stumble.
Derivatives:
blunderer n. blunderingly adv.
Etymology: ME prob. f. Scand.: cf. MSw blundra shut the eyes