And as he delivered the reply, Miss Squeers burst into a shower of tears; arising in part from desperate vexation, and in part from an impotent desire to lacerate somebody’s countenance with her fair finger-nails.
There are no more uses of "laceration" in the book.
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To treat a minor laceration, clean the cut and close it.
If tetanus shots are not up-to-date, it might be wise to get one after any laceration.