a promise or assurance that something will be upheld; a guarantee, assurance, or pledge.
メーカーはこの家電の品質を保証する。
The manufacturer guarantees the quality of this appliance.
家賃を支払えない場合、保証人が代わりに支払うことになる。
If you can't pay the rent, the guarantor will have to pay instead.
契約に違反した場合、売主は損害を保証しなければならない。
If the contract is breached, the seller must compensate for damages as a guarantee.
a warranty — a commercial or legal assurance that a product or service will be repaired or replaced within a certain period.
このパソコンは購入から1年の保証が付いている。
This computer comes with a one-year warranty from the date of purchase.
製品の不良は保証で対応してもらえますか？
Will defects in the product be covered under warranty?