Meaning of 一役買 in Japanese

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Definition of 一役買

いちやく(ichiyaku) 【一役】

(n) an office; an important office
万次郎はこの二国をお互いに親しくするために一役果たしました。
Manjiro played a part in making the two countries friends with each other.

ひとやく(hitoyaku) 【一役】

(n) role (which someone or something plays in a given situation); part; contribution (to a given situation)

ひとやくかう(hitoyakukau) 【一役買う】

(v5u) to take on a role; to take part
彼はその件に一役かっているらしい。
He seems to be involved in that matter.