The Collaborative International Dictionary of English v.0.48:

Spruce \Spruce\, v. t. [imp. & p. p. Spruced (spr[udd]st); p.
   pr. & vb. n. Sprucing (spr[udd]"s[i^]ng).]
   To dress with affected neatness; to trim; to make spruce; --
   often used with up; as, to spruce up the house for Company.
   [1913 Webster]