sketch

1 sketch /ˈskɛtʃ/ noun
plural sketches
1 sketch
/ˈskɛtʃ/
noun
plural sketches
Britannica Dictionary definition of SKETCH
[count]
1 
: a quick, rough drawing that shows the main features of an object or scene
2 
: a short description of something
2 sketch /ˈskɛtʃ/ verb
sketches; sketched; sketching
2 sketch
/ˈskɛtʃ/
verb
sketches; sketched; sketching
Britannica Dictionary definition of SKETCH
1 
: to make a quick, rough drawing of (something)
[+ object]
[no object]
— often + out
2 
[+ object] : to describe (something) briefly — often + out

sketch in

[phrasal verb]
sketch in (something) or sketch (something) in
: to add (something, such as details) to a drawing, description, etc.