buckle down (to task)

Translations
сосредоточиться (на задаче)
We need to buckle down to the task if we want to meet the deadline.
Нам нужно сосредоточиться на задаче, если мы хотим уложиться в срок.
Definitions
To begin to work hard and seriously on a task or activity, focusing one's attention and effort in order to accomplish it.