operation

delicate

The surgeon explained that the heart operation would be delicate and require several hours.

have, undergo

My grandmother underwent a heart operation last month, but she's recovering well now.

come through, survive

Her father survived the operation and was back home within two weeks.

carry out, perform

The doctors carried out a successful operation on the patient last week.

during a/the ~

The patient remained unconscious during the operation to remove the damaged cartilage from his knee.

~ for

My grandmother had an operation for her eyesight last month.

~ on

The surgeon performed a delicate operation on her knee last month.

tricky

The surgeon explained that the heart operation would be quite tricky because of the patient's age.

clean-up, drilling, mining, mopping-up, offensive, peacekeeping, relief, rescue, salvage, security

The rescue operation successfully brought all the trapped miners to safety.

banking, building, business

The bank had to suspend its banking operations during the system upgrade last week.

begin, launch, mount, undertake

The police began a search operation after the child went missing yesterday afternoon.

during a/the ~

The hospital had to cancel all surgeries during the operation on the main water pipe.

day-to-day

The manager handles the day-to-day operation of the restaurant with great skill.

come into

The new safety rules came into operation at the factory last month.

cease

The hospital had to cease operations for two weeks due to the storm damage.

during ~

The surgeon had to stop briefly during operation when the patient's heart rate dropped suddenly.

in ~

The new safety rules have been in operation since the factory reopened last month.

in/into full operation

The new hospital came into full operation last month and is now treating patients.