clamber - definition and synonyms

verb [intransitive] 

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/ˈklæmbə(r)/
present tense
I/you/we/theyclamber
he/she/itclambers
present participleclambering
past tenseclambered
past participleclambered
  1. to climb something with difficulty, using your hands and feet
    clamber up/over/into etc:

    I clambered up the ladder into the hay loft.