A firm promise or guarantee that something will happen or is true. Often used in the phrase 請け合いだ (it's a sure thing).
See also: 請け合う
His success is guaranteed.
The quality of this product is assured.
保証 is a more formal or legal guarantee, while 請け合い is a personal assurance or promise.
making a promise too easily; accepting without thinking
Standard kanji spelling; 請け conveys the sense of undertaking or guaranteeing.
Abbreviated kanji form; rarely used.
Variant using 受け; less common but still seen.
Abbreviated variant; rarely used.
Noun form of the verb 請け合う (to undertake, to guarantee), from 請ける (to receive, to undertake) + 合う (mutually).