ADJ
- major
- minor, small
- life-saving, vital
- emergency
- routine
- delicate
- a delicate eye operation
- exploratory
- surgical, transplant
- heart, knee, etc.
VERB + OPERATION
- have, undergo
- He had an operation to remove a tumour
- come through, survive
- She came through the operation very well
- carry out, perform
- the surgeon performing the operation
PREP
- during a/the ~
- She woke during the operation
- ~ for
- an operation for a kidney problem
- ~ on
- a major operation on his heart
ADJ
- big, large-scale, major, massive
- covert, undercover
- combined, joint
- tricky
- a tricky rescue operation
- intelligence, military, naval, police
- guerrilla
- clean-up, drilling, mining, mopping-up, offensive, peacekeeping, relief, rescue, salvage, security
- UN troops supervised the relief operations
- banking, building, business
- restrictions placed on business operations
VERB + OPERATION
- begin, launch, mount, undertake
- The authorities launched a massive security operation in the city
- carry out, conduct
- supervise
PREP
- during a/the ~
- during joint military operations
PHRASES
- a theatre of operations (= where military operations take place)
ADJ
- effective, efficient, smooth
- day-to-day
- the smooth day-to-day operation of the department
VERB + OPERATION
- come into
- A ceasefire came into operation in May
- bring/put sth into
- cease
- The factory will cease operation at the end of the year
PREP
- during ~
- The machine can get very hot during operation
- in ~
- The current tax system has been in operation for ten years
PHRASES
- in/into full operation
- the only reactor in full operation