The Collaborative International Dictionary of English v.0.48:
Blanket \Blan"ket\, v. t. [imp. & p. p. Blanketed; p. pr. &
vb. n. Blanketing.]
1. To cover with a blanket.
I'll . . . blanket my loins. --Shak.
2. To toss in a blanket by way of punishment.
We'll have our men blanket 'em i' the hall. --B.
3. To take the wind out of the sails of (another vessel) by
sailing to windward of her.
Blanket cattle. See Belted cattle, under Belted.
WordNet (r) 3.0 (2006):
adj 1: covered with (or as if with) a blanket