busy

1 busy /ˈbɪzi/ adjective
busier; busiest
1 busy
/ˈbɪzi/
adjective
busier; busiest
Britannica Dictionary definition of BUSY
[also more busy; most busy]
1 
: actively doing something
— often + with
2 
a  : full of activity or work
b  : full of people or things
3 
chiefly US, of a telephone or telephone line : being used
◊ When you dial a telephone line that is already in use, you hear a sound that is called a busy signal.
4 
: full of many details

get busy

: to start doing work

— busily

/ˈbɪzəli/ adverb

— busyness

/ˈbɪzinəs/ noun [noncount]
2 busy /ˈbɪzi/ verb
busies; busied; busying
2 busy
/ˈbɪzi/
verb
busies; busied; busying
Britannica Dictionary definition of BUSY

busy yourself

: to make or keep yourself busy : to occupy (yourself) with work or an activity