re·tract·a·ble
adjective/rɪˈtræktəbl/
/rɪˈtræktəbl/
- that can be moved or pulled back into the main part of something
可缩进的；可拉回的 - a knife with a retractable blade
弹簧刀
Oxford Collocations DictionaryRetractable is used with these nouns:- claw
- roof
- a knife with a retractable blade