From Longman Dictionary of Contemporary Englishshinny up/downshinny up/downCLIMBto climb quickly up or down a tree, pole etc by using your hands and legs SYN shin British English → shinny
Examples from the Corpus
shinny up/down• The boy panicked and tried more desperately to shinny up the mast.• His brother was eight and spent two days learning how to shinny up to the office. 