ことのついで

expression

take the opportunity to do something else; while you're at it

Used when doing something additional or different while already engaged in another activity. Often appears in the pattern ～のついでに.

See also: もののついで

• 買かい物ものに行いくなら、ことのついでに郵ゆう便びん局きょくにも寄よってきて。

  If you're going shopping, stop by the post office while you're at it.

• ことのついでに窓まども拭ふいた。

  I took the opportunity to wipe the windows too.