folding
adjective [ before noun ] uk/ˈfəʊl.dɪŋ/ us/ˈfoʊl.dɪŋ/
（椅、床、自行车等）折叠式的，可折叠的
A folding chair, bed, bicycle, etc. can be folded into a smaller size to make it easier to store or carry.
（门）折叠的
A folding door is made of several parts joined together that can be folded against each other when the door is opened.