A central cohesive source of stability and security; a person or thing that is critical to a system or organisation.
A pin inserted through holes at the end of an axle or shaft, so as to secure a wheel or shaft-mounted device.
To adopt as, or serve as, a central cohesive source of stability and security.
That which gives strength or in which strength consists; a supporting factor or member; mainstay.
A cord or tendon of the body.
A cord or string, particularly (music) as of a musical instrument.
Muscular power, muscle; nerve, nervous energy; vigor, vigorous strength.
To knit together or make strong with, or as if with, sinews.