First-string and Lead off

First-string adjective - Of the very best kind.

Lead off and first-string are semantically related. In some cases you can use "Lead off" instead an adjective phrase "First-string".

Lead off verb - To take the first step in (a process or course of action).

First-string and lead off are semantically related. Sometimes you can use "First-string" instead an adjective "Lead off".