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The Collaborative International Dictionary
foreslow

Forslow \For*slow"\, v. i. To loiter. [Obs.] [Also spelled foreslow.]
--Shak.

Wiktionary
foreslow

vb. 1 (context obsolete intransitive English) To be slow or tardy; to slow down. 2 (context obsolete transitive English) To slow, hinder, delay, impede.