on the job
Working hard; not wasting time.
Joe was on the job all of the time that he was at work.
The school paper came out on time because the editors were on the job.
on the lam
Running away, especially from the law; in flight. Sometimes used in the phrase take it on the lam.
The bank robber was on the lam for ten months before the police caught him.
After a big quarrel with her father, the girl took it on the lam.
on the level
Honest and fair; telling the whole truth.
Our teacher respects the students who are on the level with her.
Joyce wondered if the fortune-teller was on the level.
on the lookout
Watching closely.
The little boy was on the lookout for his father.
Forest rangers are always on the lookout for forest fires.
The doctor is on the lookout for a new secretary.
on the loose
Free to go; not shut in or stopped by anything.
The zookeeper forgot to close the gate to the monkey cage and the monkeys were on the loose.
All of the seniors were on the loose on "Senior Skip Day."
on the make
Promiscuous or aggressive in one's sexual advances.
I can't stand Murray; he's always on the make.
Pushing to get ahead in one's career; doing anything to succeed.
The new department head is a young man on the make, who expects to be company president in ten years.
on the market
For sale.
In the summer many fresh vegetables are on the market.
The Goodwins put their house on the market in January, but they did not sell it till August.
on the mend
Healing; becoming better.
John's broken leg is on the mend.
Mary's relationship with Joan is on the mend.