補釘

variant of 補丁|补丁[bu3 ding5]

to repair / to patch / to mend / to make up for / to fill (a vacancy) / to supplement

nail / to follow closely / to keep at sb (to do sth) / variant of 盯[ding1]

to join things together by fixing them in place at one or more points / to nail / to pin / to staple / to sew on