also: まつかえ
noun
Refers to evergreen trees, especially pines and cypresses, as a category. Often used in literary or poetic contexts.
松柏は冬でも緑を保つ。
Pines and cypresses stay green even in winter.
noun
pine and cypress
Specifically refers to the two types of trees, pine and cypress, often symbolizing steadfastness.
庭に松柏を植えた。
I planted a pine and a cypress in the garden.
noun
Figurative use derived from the evergreen nature of pines and cypresses, symbolizing unwavering loyalty or steadfastness. Rare in modern Japanese.
彼の松柏の節操は皆の模範だった。
His unwavering integrity, like that of pine and cypress, was a model for everyone.
常緑樹 is the common, everyday term for 'evergreen tree', while 松柏 is a literary or classical term specifically evoking pines and cypresses.
Compound of 松 (pine) and 柏 (cypress). The figurative sense of constancy comes from the trees' ability to stay green through winter.