Paul has been knocking out new songs for the album.
knock yourself out
informalto work very hard in order to do something well
knock somebody/something ↔ over
1to hit someone with a vehicle while you are driving, so that they are hurt or killed:
A woman was knocked over by a bus last year.
2American Englishinformalto rob a place such as a shop or bank and threaten or attack the people who work there
knock something ↔ together
to make something quickly, using whatever you have available:
We should be able to knock something together with what's in the fridge (=make a meal from items of food in the fridge).
knock somebody/something ↔ up
1to make something quickly and without using much effort:
Michael knocked up a shed in the back garden.
2British Englishto wake someone up by knocking on their door:
What time do you want me to knock you up in the morning?
3informalnot politeto make a womanpregnant
WORD FOCUS: hit WORD FOCUS: hit with your fist:punch, thump, bash with your open hand as a punishment:smack, spank, slap with a hammer:bang, hammer in order to get attention:bang, knock, tap, hammer accidentally:bump into, crash into, strike, bang, knock, collide (with) ➔ See alsohit
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.