first-string

adjectives

of members of a team; not substitutes

first-string

is similar to

in accordance with fixed order or procedure or principle

"his regular calls on his customers"; "regular meals"; "regular duties"

being a regular member of a team

"first-string players"

first-string

is similar to

of first rank or importance or value; direct and immediate rather than secondary

"primary goals"; "a primary effect"; "primary sources"; "a primary interest"