jar ----> container
jazz record // songs ----> listen to music
job ----> work
join us ----> with us
judge ----> punish
just a minute ----> soon
just half of the normal load ----> fewer sth.
just happened to do ----> be unintentional
just last week ----> recently
just make a decision ----> quickly

keep an eye (out) on sth. (for sb.) ----> help sb. find sth. // watch sth.
keep current on the news ----> get reports
keep jamming ----> be not working properly
keep on // carry on with ----> continue
keep someone waiting ----> be late
keep to oneself ----> not sociable
keep track of ----> be cognizant of
keep up with ----> study
keep/prevent sb. from driving very fast ----> reduce the driving speed
kill time ----> need sth. to do
kind of // sort of ----> a little // somewhat

lab report // class ----> workload
laboratory experiment ----> project
lack of jobs // need work ----> employment opportunities
last week ----> recently
last year ----> a while ago
late ----> on time
late this afternoon ----> later in the day
lately ----> recently
later ----> postpone
later this week ----> future
latest bestseller ----> recent book
lay off ----> let go // dismiss // fire
lay off sb. // let sb. go ----> lose one's job
leave ... up to sb. ----> decide about sth. for oneself
leave // be so irresponsible ----> be not careful with
leave for // make for // set out for // set off for ----> go to/toward
leave the studio open late tonight // get this assignment done on time ----> need extra time
leave well enough alone ----> do sth. as is
lend // on loan ----> borrow
Let me finish this point, then ----> He doesn't want to be interrupted.
let sb. use ----> lend sb.
letter of recommendation ----> reference
life in the old west ----> historical novel
lift off one's shoulders ----> be relieved
light up ----> smoke
like ----> best selection
line by line ----> methodically
listen for one's phone ----> answer/take one's calls
listen to ----> follow
look after ----> take care of
look at the manual ----> read the instruction
look for a bigger apartment ----> has too much furniture
look for a needle in a hay stack ----> be hard to find
look on with ----> share
look over // proofread ----> check // review // look through
Look who's talking. ----> He should follow his own advice.
lose ----> shed
lose one's voice ----> unable to talk
lose track of time ----> not realize what time it is
lost ----> misplace
love // lover ----> like
love to fish ----> enjoy go fishing
Lucky you! ----> wish