Other forms: crossbars
The crossbar is the tube joining the seat to the steering column. A high crossbar, sit on the crossbar, the bike's crossbar.
It stiffens the frame, which is why the sloping and dropped versions on modern bikes are a compromise between stiffness and ease of mounting. In football the crossbar is the bar across the top of the goal. Note the compound of cross and bar.
1nouncrossbarThe tube joining the seat to the steering column of a bicycle.
“He gave his little sister a ride on the crossbar of his bike.”
2nounbarThe bar across the top of a goal.
“His shot hit the crossbar and bounced back out into play.”
crossbar is a bar.
Cross plus bar. The compound names the bar by the way it lies across the frame.
Middle English
crose bar
English, today
crossbar
From Middle English crose bar, equivalent to cross- + bar.
Etymology from Wiktionary, CC BY-SA