chop and change
US /tʃɒp ənd tʃeɪndʒ/
UK /tʃɒp ənd tʃeɪndʒ/

1.
反复无常, 朝令夕改
to keep changing your mind or opinions, or to keep changing what you are doing
:
•
He's always chopping and changing his plans, so it's hard to make arrangements.
他总是反复无常地改变计划,所以很难安排。
•
The government has been chopping and changing its policies on education.
政府一直在反复修改其教育政策。