vouchsafe - definition and synonyms

verb [transitive] formal 

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/ˌvaʊtʃˈseɪf/
present tense
I/you/we/theyvouchsafe
he/she/itvouchsafes
present participlevouchsafing
past tensevouchsafed
past participlevouchsafed
  1. to give, promise, or offer something to someone who you trust