Большой англо-русский и русско-английский словарь
to be on the qui vive, to be alert, to be on one's guard;
to keep one's eyes open/peeled разг.
глядеть в оба в энциклопедиях
to be on the qui vive, to be alert, to be on one's guard;
to keep one's eyes open/peeled разг.