Akademik

нога за ногу
НОГА ЗА НОГУ плестись, идти и т.п.
[NP; Invar; adv; fixed WO]
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(in refer, to people, horses etc) (to go, move etc) very slowly:
- X плёлся{{}}нога за ногу - X was dragging himself along;
- X was plodding (trudging) along;
- X was barely moving.

Большой русско-английский фразеологический словарь. — М.: ACT-ПРЕСС КНИГА. . 2004.