1 bottom /ˈbɑːtəm/ noun
plural bottoms
1 bottom
plural bottoms
Learner's definition of BOTTOM
[count] : the lowest part, point, or level of something usually singular
[count] : the part of something that is below or under the other parts usually singular
[count] : the lowest point or surface inside something : the part of something hollow that is furthest from the top usually singular
[singular] chiefly British : the part of something that is furthest away
[count] : the part of the body on which you sit : buttocks
[singular] : a position of little power in a company or organization
[singular] : a low rank or position
[noncount] : the worst position, level, or condition
see also rock bottom
[singular] : the surface that is under a body of water
bottoms [plural] : the flat, low land along a river or stream : bottomland
[count] : a piece of clothing that is worn on the lower part of the body often plural see color picture on this page
[singular] : the second half of an inning in baseball
[noncount] chiefly British : the lowest gear of a car

at bottom

chiefly British
: in reality : really

at the bottom of the pile

see 1pile

be/lie at the bottom of

chiefly British
: to be the source or originator of (something)

bottoms up

used as a toast or to tell people to finish their drinks

from the bottom of your heart

see heart

from top to bottom

see 1top

get to the bottom of

: to find out the true reason for or cause of (something)

the bottom drops/falls out

◊ If the bottom drops/falls out of something, it suddenly fails or becomes unable to continue in a normal and effective way.

the bottom of the barrel

: the lowest possible condition, level, etc.

— bottomed

/ˈbɑːtəmd/ adjective
2 bottom /ˈbɑːtəm/ adjective
2 bottom
Learner's definition of BOTTOM
always used before a noun
: in the lowest position
see also bottom line
: living at the lowest level of an ocean or lake

bet your bottom dollar

see 2bet
3 bottom /ˈbɑːtəm/ verb
bottoms; bottomed; bottoming
3 bottom
bottoms; bottomed; bottoming
Learner's definition of BOTTOM

bottom out

[phrasal verb]
: to reach a lowest or worst point usually before beginning to rise or improve