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Phrase(s): Never halloo till you are out of the woods.
Prov. Do not rejoice until you are certain that your problems are over. • Jill: Now that I have a full-time job, I’m certain to be able to pay all my debts. Jane: But it’s just a temporary job; it may not last long. Never halloo till you are out of the woods.
McGrawhill's American Idioms And Phrasal Verbs