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

bottom dollar • top dollar
bottom dollar —(coll.) one’s last dollar: When he got down
to his bottom dollar it was time to head back into the moun-
tains for another year’s worth of trapping.
top dollar —(coll.) a high or the highest price: A lot of those
guys had paid him top dollar to buy their enlistment in the
six months’ program.
bottom drawer • top drawer
bottom drawer —the collection of articles for the home that
a girl gathers before she gets married: I got some lovely towels
at the sale, mum. I can’t make up my mind whether to start
using them or put them in my bottom drawer.
top drawer —(coll.) the upper ranks of society: I don’t know
anything about art, and I haven’t met any grand people. I’m
not what he calls out of the top drawer.
bottom line • bottom of the line
bottom line— the final determining factor; the essence of
the argument: George Murphy and Ronald Reagan certainly
qualified because they have gotten elected. I think that’s the
bottom line.
Note: 
The expression does not correlate in meaning with the
phrase down line—(Railroad) a single track of rails in a double
line of railway (for trains traveling from right to left): Originally
the east line was the up line and the west line was the down
line, giving conventional left hand running.
bottom of the line —said of the lowest quality, especially in
merchandise: We offer quality products for a price competitive
to what our competitors sell their bottom of the line products
for.
See also: top line / up line.
bottom up • bottoms up
bottom up —upside down: A yawl-boat was landed bottom
up from the hurricane-deck upon the heads of those below.
bottoms up —(usually used as a toast) finish one’s drink to the
last drop: The old priest drank his highball almost bottoms up.