cry/sing etc your heart outif you cry, sing etc your heart out, you do it with all your energy or emotion 号啕大哭/放声歌唱等 He found me crying my heart out and was so kind. 他发现我在号啕大哭，对我很体贴。
→ eat your heart out at eat(4), → pour your heart out at pourcry/sing etc your heart out• Anyway, then she just sprawled on the floor and cried her heart out.• After this last furlough we paid a last sad visit to the school and found a small girl crying her heart out.• March 7: I cried my heart out last night after seeing the movie High Tide.• For the first time since I cried my heart out in Puerto Rico - I was crying.• We would march along in step, doing eighty-eight paces to the minute, singing our hearts out.• She cried her heart out, all because of an unruly trouble-making, black-hearted child who was ripping her apart.
→ cry/sing etc your heart out at heart1(15)