rear one's head

Definitions

1. To raise one's head.
   literally
2. To appear and cause problems or stress, especially at an inopportune time (said of something or [rare] someone that is undesirable or unwelcome).
   idiomatic

Equivalents

Examples

“One problem that reared its head in 1983 would prove⟳ more difficult to solve⟳, with the heat that summer leading to a number⟳ of engine failures.”

“For large parts of this season City have⟳ been far from the level that saw⟳ them win⟳ the Treble last⟳ season, especially defensively. Those issues reared their head again, and will lead⟳ to questions about the summer recruitment, with some poor defending for both Newcastle goals.”

CEFR level