Make certain of.
Roget 768: promise; give a promise etc. n.; undertake, engage; make an engagement, form an engagement; enter into an engagement, enter on an engagement; bind oneself, tie oneself, pledge oneself, commit oneself, ... show more
Inform positively and with certainty and confidence.
Assure somebody of the truth of something with the intention of giving the listener confidence.
Dutch: verzekeren, overtuigen, persuaderen
Be careful or certain to do something; make certain of something.
Cause to feel sure; give reassurance to:
— The airline tried to reassure the customers that the planes were safe.
Make a promise or commitment.
Dutch: beloven, toezeggen
Moby thesaurus: afford hope, and candle, ascertain, assert, assert under oath, asseverate, attest, augur well, avouch, back, be convincing, be sponsor for, bear up, bid fair, bolster, bond, book, brace up, bring home to, bring over ... show more.
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