A difficult task or challenge.
Трудная задача или вызов. (Trudnaya zadacha ili vyzov.)
"Getting this project done on time is going to be a hard row to hoe."
"Завершить этот проект вовремя будет трудной задачей." (Zavershit etot proyekt vovremya budet trudnoy zadachey.)
to introduce or create new concepts or methods
to identify or recognize something with precision
to not do what one said one would do
to finalize or confirm an agreement
to do something secretly without their knowledge
to end successfully for someone