WordRel.com

• sign as evidence of legal transfer

  synonym	indorse
  derivation	endorsementendorser
  other	endorsementendorser
  hypernym	sign
  hyponym	co-signcosignvisa
  is entailed by	ratifysign

• be behind; approve of

  synonym	backindorseplump forplunk forsupport
  derivation	endorsementendorsementendorser
  other	endorsementendorsementendorser
  hypernym	approveO.K.okaysanction
  hyponym	championdefendguaranteewarrant
  similar	backendorseindorsesecond

• guarantee as meeting a certain standard

  synonym	certifyindorse
  derivation	endorsement
  other	endorsement
  hypernym	guaranteewarrant

• give support or one's approval to

  synonym	backindorsesecond
  derivation	endorsementendorsementendorser
  other	endorsementendorsementendorser
  hypernym	back upsupport
  similar	backendorseindorseplump forplunk forsupport