Keywords: show up, pop up, unexpected

Sign Definition

As a Noun

1. Something that happens unexpectedly or without warning.

As a Verb or Adjective

1. To happen suddenly or as a surprise. English = (be) unexpected.
2. To appear in a place unexpectedly or to attend an event unexpectedly or without having been invited. Idiomatic English = show up, pop up.

As Modifier

1. Used next to a verb to mean the action happens suddenly and as a surprise. English = unexpectedly.