一上

yīshàng
  1. (literary) all of a sudden; all at once
  2. all of a sudden; all at once

Wiktionary

Examples

他让我等了整整一上午。

He kept me waiting all morning.

Source: Tatoeba

Entry Composition

1 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
=2 上 shǎng used in 上声 shǎngshēng
=2 上 shàng
  1. (bound form) up; upper; above; previous
  2. first (of multiple parts)
  3. to climb; to get onto; to go up
  4. to attend (class or university)
  5. (directional complement) up
  6. (noun suffix) on; above