Senses
一直 always
continuously; all along; all the time without interruption
一直 from... to...
used to emphasize the range or extent of something, typically appearing between 从 ... and 到 ...
一直 straight
in a straight line; moving in a constant direction without turning
一直 vertical stroke
a vertical line or stroke in Chinese calligraphy or writing
一直 a stretch
(archaic) a stage of a journey or a distance covered without stopping