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To enable undercurl in Alacritty on Windows, you need to modify the configuration file. Here are the steps to do so:

1. Open the Alacritty configuration file. The configuration file is located at: C:\Users\{username}\AppData\Roaming\alacritty\alacritty.yml

2. Scroll down to the ui section of the configuration file.

3. Add the following lines to the ui section to enable undercurl:

   render_timer: true
   undercurl_style: 'solid'
   undercurl_width: 2
   undercurl_offset: 2
   

4. Save the configuration file and restart Alacritty.

After restarting Alacritty, undercurl should be enabled and you can test it by running a command that produces undercurl output.