1[1] once; one time; awhile | Often after a verb to indicate a short moment and sometimes shortened to just 下 (which the HK media inexplicably writes as 吓)| eg. 等一下; 講(一)下嘢; 睇下; 瞓一下 | Mand.-only synon.: 一會兒 [2] all at once; at one fell swoop | Synon.: 一下子