linchpin
5 synonyms for linchpin, grouped by meaning and by how common each one is.
Noun — A pin pushed through the end of an axle to keep a wheel from sliding off.
Synonyms
Less common
Still standard English, but they carry more weight.
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
How to use linchpin
The word patterns that sound natural to a native speaker.
Etymology
From Old English lynis ("axle pin") combined with pin; the figurative sense of "essential connecting piece" developed in the 20th century.
Full origin of linchpin →