to examine a large amount of information or items carefully
тщательно исследовать большое количество информации или предметов (tshchatel'no issledovat' bol'shoye kolichestvo informatsii ili predmetov)
"I spent the afternoon sifting through old emails for the missing file."
"Я провел послеобеденное время, перебирая старые электронные письма в поисках пропавшего файла." (Ya provel posleobedennoye vremya, **perebiraya** staryye elektronnye pis'ma v poiskakh propavshego fayla)
To start thinking carefully about something
using data and statistical algorithms to forecast future out...
to understand the situation
to change the rules or conditions to make success harder
to receive public attention or recognition
to assemble something quickly and roughly