поръчителствам означава в английски

guarantee [guaranteed, guaranteeing, guarantees]▼(to assume responsibility for a debt)
verb
[UK: ˌɡæ.rən.ˈtiː] [US: ˌɡe.rən.ˈtiː]

vouch [vouched, vouching, vouches]▼(to affirm or warrant the correctness or truth of (something); also, to affirm or warrant (the truth of an assertion or statement))
verb
[UK: vaʊtʃ] [US: ˈvaʊtʃ]