The bottom bracket is the bearing the pedal cranks turn in. Replace the bottom bracket.
It takes every bit of the rider's weight and all the water off the road. A creaking bottom bracket is the noise most often blamed on something else.
1nounbottom bracketThe bearing the pedal cranks turn in.
“The bottom bracket had run dry and ground itself flat.”
bottom bracket is a part.
Named from early frames, where it was a separate bracket bolted to the bottom of the frame.
From earlier bicycle designs, when it was a separate piece bolted onto the bottom of the frame. In modern designs the bottom bracket shell (or housing) is an integral part of the frame.
Etymology from Wiktionary, CC BY-SA
Practised in Cycling