Heavy going adjective
Something that is difficult to understand or boring to attract attention
The film is heavy going to attract my attention.
I found chemistry heavy going when I was at school.
1. Used to indicate a light gray-brown color.
2. Boring, dull.
Used to refer to an old person who is boring and old-fashioned
To leave a place that is tedious or unpleasant.
One needs to understand the basic techniques or primary details of something before taking actions that require greater skills
Peter failed because he did not learn to walk before he ran.