A stitch made by inserting the needle at the midpoint of a preceding stitch so that the stitches overlap by half lengths. 回针缝在先前缝的一针中间加缝的一针，以便使针脚的交错重叠为原来长度的一半
She reckoned she had cut her cost by half. 她估计她减少了一半的费用。
If we wire into this job we shall be finished by half past ten. 如果我们抓紧干，10点半前就可以干完。
It's exasperating to run for a train and then miss it by half a minute. 跑著赶火车，却差半分钟没赶上，真气人。
