to keep up a house	to maintain it in good condition
to keep up someone's interest	not to allow someone to get bored
to keep up with the Joneses	to aim at not being left behind them socially: to have as many 'status symbols' as they have
I can't keep up with you	You are going too fast for me, either physically in walking or intellectually
to keep up withlin touch with someone	to remain in contact
to keep to the point	to cut out irrelevant matter
to keep on with something	to continue to work at something
to keep house for someone	to do the housework for someone: to be a housekeeper
Keep off the grass	Do not walk on it
to keep off a subject	To avoid mentioning it
to keep off mosquitoes, flies etc.	To prevent them from worrying you
Keep out!	Do not enter
to keep something from someone	Prevent him from finding out about it
to knock down someone	To knock someone flat in an accident or fight
I knocked him down to $5	I haggled until he agreed to accept $5 for the article: colloquial
to knock up someone	To awaken someone at a certain time
to knock up something	To make it oneself
to knock someone out	To punch someone so that he falls down unconscious-in boxing or a fight
to lay down the law	To speak with great authority-generally without any justification
to lay down one's life	To sacrifice it for one's country
to lay down one's arms	To surrender
to lay on electricity, gas, etc.	To supply it by connecting it up to the main
the lay-out of a garden etc.	The design of it
to lead off	To start a discussion etc
to be led away by one's feelings	To be overpowered by them so that one loses rational control
to be laid up with...	To be confined to bed on the doctor's orders because of . . .
to lay off workers	To tell workers to go home because there is no work for them
a leading question	A question designed to elicit a particular answer
to let someone down	To fail someone by not keeping one's promise
to let someone into a room	To allow someone to enter
to let someone into a secret	To tell someone it
to let off rooms	To allow tenants to occupy them
to let off fireworks or guns	To make them explode
to let someone off	Not to punish someone when he could justifiably be punished
to let out clothes	To make them larger: the opposite of to take in clothes
to let out a secret	To betray it by accident
to look at	To view, to observe
to look on/upon someone as a friend	To regard someone as a friend
to look on	To be a passive spectator
an onlooker	A chance spectator
to look over 1	To check or correct a manuscript etc.
to look over 2	To give a view of
to look over someone's book	To get help by seeing what he has written
to overlook 1	To give a view of
to overlook 2	Not to notice: to miss a mistake etc.
to overlook 3	To forgive
to look into something	To investigate something
to look down on someone	To despite someone
to look up to someone	To admire someone
to look someone up	To take the trouble to visit someone when you happen to be in his home town
to look someone up and down	To survey someone critically from head to foot
to look through something	to read something rather cursorily
to look for 1	To search for something lost
to look for 2	To expect or exact
to look forward to doing something	To expect to enjoy something
to look like someone	To resemble someone
It looks like remaining fine	It will probably remain fine
What does he look like?	What kind of appearance does he present?
to look after something or someone	To take care of something or someone
to look out over	To command a view of
Look out!	take care!