clamber[verb]Synonyms: climb, claw, scale, scrabble, scramble, shin  
English Thesaurus: climb, ascend, go up, scale, clamber, ... [TahlilGaran] English Synonym Dictionary ▲
 clam‧ber /ˈklæmbə $ -ər/ 
 verb [intransitive always + adverb/preposition][
Date: 1300-1400; 
Origin: Perhaps from clamb, old past tense of climb]
 to climb or move slowly somewhere, using your hands and feet because it is difficult or steep
clamber over/across etc They clambered over the slippery rocks.
 They clambered over the slippery rocks. We all clambered aboard and the boat pulled out.
 We all clambered aboard and the boat pulled out.  [TahlilGaran] Dictionary of Contemporary English ▲