What does "highball" mean?

A cocktail made from a spirit plus soda water etc.

What is a synonym for "highball"?

Common synonyms include: aperitif, ball the jack, barrel, boom, bowl along, breeze.

noun, verb, slang

noun, verb, slang ·Moderate ·High school level

Noun

1
A cocktail made from a spirit plus soda water etc.
2
a mixed drink made of alcoholic liquor mixed with water or a carbonated beverage and served in a tall glass wordnet
3
An all clear or full speed ahead signal. US
"A white ball hauled up to the crossbar indicated that the track was clear; a black ball, run up half way, meant stop. This was the origin of the use of the word "highball" to indicate a clear line ahead, which is still used in U.S.A. railway practice."
4
A very high bouldering problem, often with a hard landing.
"2014, EpicTV.com Austrian all rounder Alex Luger climbs what he describes as a highball boulder problem and what most people would call a solo."
5
Clipping of highball glass, a tall glass tumbler used for serving highballs. abbreviation, alt-of, clipping
"It's great for serving heavier drinks in. Highballs and pint glasses are excellent substitutes."

Verb

1
To make an estimate which tends toward exaggeration.
"If we highball the price, it comes out to $240. If we lowball it, it's closer to $200."
2
To move quickly; to hightail. US, dated, possibly, slang
"Booster-equipped 628 highballs west at Glen Lake, Minn., back in 1947."