To finish one's work; to complete tasks that need to be done.
昼までに今やっている仕事を済ませたい。
I want to finish the work I'm doing by noon.
小さな用事は帰る前に済ませておこう。
Let's take care of the small tasks before going home.
彼女は期日までにすべての仕事を済ました。
She finished all the work by the deadline.