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To tighten and tie up the laces of some clothing or equipment one or someone else is wearing. In this usage, a noun or pronoun can be used after "lace" when talking about someone else. He laced up boots and skated out onto the ice. Gosh this dress is tight. Could you lace me up? Make sure you've laced your shoulder pads up before heading out onto the field.
lace someone up
to tie someone's laces; to help someone get dressed in a garment having laces. Would you please lace me up? I can't reach the ties in the back. I laced up Sally, as she requested.
lace something up
to tie the laces of something. Lace your shoes up, Tommy. Lace up your shoes.
1. To fasten shoes or clothing by tightening and tying laces: I laced up my skates before my lesson. We laced our hiking boots up before we headed out.
2. To tighten and tie the laces on someone's shoes or clothing: Come over here so I can lace you up. The assistant laced up the skater before the start of the competition.