be well up on (something)

to have a good knowledge of a subject.

I'm not very well up on Ancient Greek history.

• have time on your hands
• have time on your side
• have to be seen to be believed
• have to eat words
• have to eat your words
• have to hand it to
• have to hand it to someone
• have to show for
• have to show for something
• have to spare
• have two pennies to rub together
• have up sleeve
• have up your sleeve
• have wicked way with
• have wicked way with someone
• Have will travel!
• have wits about
• have wits about you
• have words
• have words with
• have words with someone
• have work cut out
• have work cut out for
• have work cut out for you
• have your back against the wall