1 thumbtack

1 stud earring

1 nail

2 to follow closely

3 to keep at sb (to do sth)

4 variant: 盯 dīng

1 nail

2 snag

3 saboteur

1 rivet

1 to make doubly sure (idiom)

1 lit. to chop the nail and slice the iron (idiom)

2 fig. resolute and decisive

3 unhesitating

4 categorical