a walk in the park
US /ə wɔk ɪn ðə pɑrk/
UK /ə wɔk ɪn ðə pɑrk/

1.
sangat mudah, gampang sekali
something that is very easy to do
:
•
Learning to ride a bike was a walk in the park for him.
Belajar naik sepeda itu sangat mudah baginya.
•
Don't worry, this exam will be a walk in the park.
Jangan khawatir, ujian ini akan sangat mudah.