Guarantee

usgb/ˌɡærənˈtiː/Volume
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LampPro Tip 1/2
Non-legal CommitmentPlay
A 'guarantee' can express a personal commitment without legal backing. SlideYou have my guarantee that I'll return your book next week.
LampPro Tip 2/2
Stress StrengthPlay
Emphasize the strength of 'guarantee' to convince someone of your promise. SlideOur service comes with a satisfaction guarantee; we won't rest until you're happy.