Climbdown is a term used to describe a reversal or retreat from a previous position. Synonyms for the word 'climbdown' can vary depending on the context and the degree of change. One suitable synonym for climbdown can be 'backtrack', which refers to a change in course or direction. Another synonym is 'reversal', which implies a complete change of opinion or position. 'Retreat' can also serve as a suitable synonym, particularly when describing a withdrawal from a tense situation or position. Other synonyms include 'retraction', 'compromise' and 'renunciation' which are used to convey different shades of meaning depending on the context.