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drain

1 drain /ˈdreɪn/ verb
drains; drained; draining
1 drain
/ˈdreɪn/
verb
drains; drained; draining
Britannica Dictionary definition of DRAIN
[+ object] : to remove (liquid) from something by letting it flow away or out
often + from
[no object] of a container : to become empty of a liquid
[no object] of a liquid : to flow into, away from, or out of something
[+ object] : to cause (something) to lose something important + of
: to slowly be used up or to cause (something) to slowly be used up
[+ object]
[no object]
usually + away
[+ object] : to make (someone) very physically or mentally tired
[+ object] : to drink all of the liquid in (something)
[+ object] US, sports, informal : to make (a successful shot) in a very skillful and impressive way

drain off

[phrasal verb]
drain off (something) or drain (something) off
: to cause (a liquid) to flow away from something or to leave the surface of something
: to take (something important or valuable) from something
2 drain /ˈdreɪn/ noun
plural drains
2 drain
/ˈdreɪn/
noun
plural drains
Britannica Dictionary definition of DRAIN
[count]
: something (such as a pipe) that is used for removing a liquid from a place or container
: something that uses a lot of time, money, etc. usually singular usually + on
see also brain drain

down the drain

informal
used to describe something that is being wasted or lost
used to describe something that is getting much worse