n.大头钉；行动方针
v.以大头针钉住；附加
Joe hammered a tack into the wall to hang a picture. 乔用锤子把一只大头钉敲进墙中用来挂一幅画。
It would be unwise to change tack now. 现在改变方针是不明智的。
It was a brave decision to change tack in the middle of the project. 在项目进行过程当中改变方针是个大胆的决定。
The speaker suddenly changed tack and left us all rather confused. 演讲人突然改变了论调，把我们都搞糊涂了。
用作动词 (v.)My mother tacked the sleeves on before sewing them. 我妈妈在把袖子缝好之前，先用大针脚把它缝好。
They decided to tack an amendment to the bill. 他们决定在议案中附加一个修正案。
tack用作名词是“图钉,平头针”的意思,转化为动词作“把…钉上,把…固定”解,指用图钉把东西固定下来,以防止其移位。用作及物动词,接名词或代词作宾语。
tack还可作“粗缝”解,指不讲究精针细缝的情况下,用针粗粗地缝几针,用作及物动词,接布或衣服之类的名词作宾语。
tack还可用作名词,基本意思是“大头钉; 粗缝; 行动方针; 食物”。
