pledge one's word (purēj wans wād)

Idiom Promise

意味

to make a serious or formal promise

真剣または正式な約束をする (shinken mata wa seishiki na yakusoku o suru)

例文

"He pledged his word to support the cause."

"彼はその原因を支持するために誓った。" (Kare wa sono gen'in o shiji suru tame ni seikatta.)