A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

high on something • low on something
high on something —(sl.) 
1
. under the influence of a drug or
alcohol: It is far safer to drive a car when high on marihuana
than when drunk. 2. keen on smth.; enthusiastic about smth.:
“I am not high on the Thieu brand of Government,” he said,
noting that 40,000 people had been executed by it.
low on something —deficient in smth.; short of smth.: John
brewed instant coffee. He was low on sugar.
high season • high summer
high season —the most popular period at hotels, resorts, etc.
(not necessarily in summer) when rates are highest: High sea-
son in the Caribbean (when most people visit) is from Decem-
ber to April.
high summer —period when summer is at or near its peak:
December is high summer in Chile and high time for touring
the country’s famous vineyards.
high school (UK) • high school (U.S.)
high school (UK)—a secondary school for pupils aged
between eleven and eighteen: We are based at Brae High, in
Shetland — the most northerly six-year high school in Britain.
high school (U.S.)—a secondary school for pupils aged
between fifteen and eighteen: The teen-agers arrive with a
high and low
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petition that has been going around high schools across the
province since the fall.
high sea • high seas
high sea —
1
. a rough sea marked by high waves: The ship
has an advanced hullform that provides for outstanding sta-
bility and speed in high sea states. 2. the area of sea (away
from the coast) that is not under the sovereignty of any state:
Controversy arose out of demands on the part of different
states to assert exclusive dominion over areas of the high sea.
high seas — = high sea 2: “This is still a valuable ship,”
explained Torrance, “even if she is floating around the high
seas on the installment plan.”