ADJ

great, huge, large, substantial, vast
sufficient
low, small
existing
additional
last
It took my last reserves of strength and will to swim to the lifeboat
untapped
The region is thought to have some of the world's largest untapped oil reserves
hidden
She had hidden reserves of courage
capital, cash, contingency, currency, financial, foreign currency/exchange, gold, international
In the face of a severe crisis relating to international reserves, the government devalued the currency twice
coal, energy, gas, oil
timber
food
fat
The birds build up fat reserves to help them survive the winter

VERB + RESERVE

have
We have only a small reserve of coal
hold sth in, leave sth in, keep sth in
The crack troops were held in reserve behind the front line
dig into, dip into, draw on/upon, tap, use
He had to draw on reserves of strength just to finish the race
call on/up/upon, summon (up)
her ability to summon up reserves of concentration and energy
build (up)
deplete, exhaust
The company has depleted its reserves to make the purchase
pay sth out of
The dividend had to be paid out of reserves
take

RESERVE + VERB

be available
dwindle, fall

RESERVE + NOUN

currency, funds
tank
The plane was fitted with fuel reserve tanks for long-distance flights

PREP

in ~
The rail company has two trains in service and one in reserve

ADJ

national
bird, forest, game, natural/nature, wildlife

VERB + RESERVE

create, establish

ADJ

deep, strong
natural
They made him feel at ease, despite his natural reserve

PREP

with ~
Any contract should be treated with reserve until it has been checked
without ~
She trusted him without reserve (= completely)

VERB + RESERVE

play in
He will continue to train and may play in the reserves next season

RESERVE + NOUN

side, team
goalkeeper, striker, etc.
game, match

ADJ

army
strategic
volunteer

RESERVE + NOUN

force, police