on all fours
1．on all four legs ；on hands and knees匍匐而行
Alice's father got down on all fours and gave the baby a ride．艾丽丝的父亲趴下，让她骑在背上。
The baby crawled around the floor on all fours．那婴孩在地板上到处乱爬。
2．in agreement with一致的
Your argument is on all fours with mine．你的论点和我的一致。
This simile is not on all fours with the thing that it is supposed to illustrate．这个比喻同那个要说明的事物不太贴切。