bend：to move part of your body so that it is not straight or so that you are not upright.——Longman Dictionary of Contemporary English

bend：to fasten or constrain with a ‘bend’ or bond; to confine, fetter. spec. To constrain a bow with the string (hence, to wind up a cross-bow, cock a pistol); to fasten ropes, sails to the yards, horses to a vehicle. Hence arise two lines of development.——Oxford English Dictionary  @en