n. & v.
n. 1 a loose shirtlike garment with the upper part closely gathered in smocking. 2 (also smock-frock) a loose overall, esp. hist. a field-labourer's outer linen garment.
v.tr. adorn with smocking.
[ OE smoc, prob. rel. to OE smugan creep, ON smj£ga put on a garment ]