read up on (something)

to learn about something by reading a lot.

I've been reading up on Quebec's history.

• a one-day wonder
• a one-hit wonder
• a one-horse race
• a one-horse town
• a one-man band
• a one-night stand
• a one-two punch
• a one-way ticket to
• a one-way ticket to something
• a pack of lies
• a pack rat
• a pain in the ass
• a paper chase
• a paper tiger
• a paper trail
• apart from
• apart from something
• a parting shot
• a part to play
• a party animal
• a party pooper
• a pat on the back
• a peace offering
• a pearl of wisdom
• a pecking order