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Phrase(s): teething troubles
1. Lit. pain and crying on the part of a baby whose teeth are growing in. • Billy has been whining because of teething troubles. 2. Fig. difficulties and problems experienced in the early stages of a project, activity, etc. • There have been a lot of teething troubles with the new computer system. • We have finally gotten over the teething troubles connected with the new building complex.
McGrawhill's American Idioms And Phrasal Verbs