mount up - definition and synonyms

phrasal verb [intransitive]
present tense
I/you/we/theymount up
he/she/itmounts up
present participlemounting up
past tensemounted up
past participlemounted up
  1. 1
    to get much larger

    The costs are beginning to mount up.

  2. 2
    same as mount1 (sense 4)

    The soldiers mounted up and rode off.

See also main entry: mount