unexpectedly or without warning
неожиданно или без предупреждения (neozhidanno ili bez preduprezhdeniya)
"My old friend called me out of the blue after ten years."
"Мой старый друг позвонил мне неожиданно после десяти лет." (Moy staryy drug pozvonil mne **neozhidanno** posle desyati let.)
to study or explore something in great depth
an achievement to be proud of
a sudden and unexpected event
to suspect something wrong or dishonest
to appear in court to answer criminal charges
to become familiar or friendly with someone
