underscore
verb [ T ] uk/ˌʌn.dəˈskɔːr/ us/ˌʌn.dɚˈskɔːr/
（尤指为了强调）在（词语）下面画线
to underline
underscore
noun [ C or U ] uk/ˈʌn.də.skɔːr/ us/ˈʌn.dɚ.skɔːr/
下划线
the character _ on a computer keyboard, used to draw a line under a letter or word, and also used in file names where a space is not allowed