bitter end

Definitions of bitter end
1

n (nautical) the inboard end of a line or cable especially the end that is wound around a bitt

Type of:
end, terminal
either extremity of something that has length

n the final extremity (however unpleasant it may be)

“he was determined to fight to the bitter end
Type of:
extremity
an extreme condition or state (especially of adversity or disease)

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