a)LET/ALLOWif something opens the floodgates, or if the floodgates open, it suddenly becomes possible for a lot of things to happen which were prevented from happening before 打开闸门,(使)一发不可收拾
If this case is successful it could open the floodgates for thousands of similar claims.
如果本案胜诉,就有可能引发成千上万的类似索赔。
There are fears that the floodgates will open and large numbers of parents will take their children out of school.
有人担心闸门将由此打开,许多父母会将孩子从学校带走。
b)SHOW A FEELING OR ATTITUDEif the floodgates open, or if something opens the floodgates, someone begins to cry and show their emotions after keeping them hidden 打开感情的闸门,(使)感情爆发
His display of kindness to her opened the floodgates again, and she began to sob loudly.