window of opportunity UK /ˌwɪndəʊ‿əv ˌɒpəˈtjuːnɪtɪ/US /ˌwɪndoʊ‿əv ˌɑpɚˈt(j)unəti/ noun1 •A (usually limited) period of time in which suitable action can achieve success. formswindows of opportunity
