main stem; backbone; mainstay
Meanings
2 senses · 7 examplesnoun
main stem; trunk (of a plant or tree)
Refers to the central, woody structure of a plant, as opposed to branches or twigs.
The trunk of this century-old tree is as thick as three adults joining their arms around it.
When pruning fruit trees, take care to protect the main trunk from damage.
Show 1 more exampleShow fewer examples
The main trunk line of this railway has been fully connected.
noun
backbone; mainstay; central force; pillar
Figurative usage describing the most important or decisive element in a system, organization, or group.
Young and middle-aged teachers are the backbone of the teaching staff.
Technical backbone and marketing mainstay are the twin engines of the company's development.
Show 2 more examplesShow fewer examples
This trunk highway carries most of the transportation tasks for the whole province.
The rejuvenation of the cadre team means letting young people become the backbone.