Idiom

As a rule – Usually, generally
Be on the safe side – Take no chances
Be up to one’s ears – Have a lot of work / exams / reports
By all means – Definitely / certainly
Catch a cold – To get sick with a cold
Come down with – Become sick / ill with
Come up with – Find a solution / an idea
Die of hunger – Be very hungry
Every now and then – Occasionally, not often
Every other – Alternate
Got down to (work / business) – Start work without delaying
Get the ball rolling – Start an activity / make a beginning
Make a point of – Say or do something with a particular intent
Once in a blue moon – Almost never
Out of the question – impossible
The ins and outs of – All the details
Think nothing of it – That’s all right
Under the weather – Not well
To clear the air – To explain
To keep up appearance – To make it look as if you are richer or better off
To have an axe to grind – To have something to gain by an action
To get out of bed on the wrong side – To get up in the morning in bad temper
To face the music – to face the consequences
To get into hot water – To get into trouble
To make a mountain out of a molehill – To make a small matter appear much bigger
To tell a white lie – To tell a lie for a good cause
To turn over a new leaf – To become a good boy
Judge a book by its cover – should not judge a person based on his / her outlook